Date   
Re: interlocking

Mark Gurries
 

"Doug Stuard" wrote:

Hi Jerry,

What I would do (=<<$0.02) would be to relocate (slightly) the ramp
going up and to the right to the INSIDE of the staging tracks and have
it cross above the right hand staging loops at the far right side,
thereby eliminating the need for an at-grade crossing in the rear of the
layout. The turnouts will still be there, but the whole interlocking
issue would be avoided.


The at grade crossing was a way to equalize and minimize grades.
There will be access/view panels along the facia and if I'm the only
one (or one of two) operators there shouldn't be any problem. But
you always want to design for that one case...

Jerry Glow
I think Doug is on the right track but the wrong side due to the grade
run length. However, the run on the left side has the POTENTIAL to be
much longer which we can take advantage of...

See crudely edited drawing of Jerry's called Lower1a.jpg I do not think
anyone on the "WiringforDCC" list will get this picture...Attachments
are rejected...but Jerry should since I am ALSO addressing him directly
at the same time...

On the left side of the drawing, you have a track spiralling down. What
I would do is continue the spiral a bit more such that the angle permits
it to cross over the green loop of tracks while it is still at
sufficient elevation to clear the green tracks. In other words, the
spire does not have much grade in it at first till it get over the
track. No with the track having cleared the green track no drops down
on the inside (isle side) and ramps down. But instead of connecting
back in at the current crossing location..it run longer on the straight
way and cuts back in on the green track before is starts to make the
right curve that accesses the other loop of track.

Positives:

1) Total grade will be less compared to the other line but you might be
able to extend that other grade line a foot or more down the line to
ease it a bit too!

2) The grade will be eased on the curve..a grade compensated curve.
This will really help trains get up the grade. I bet it will be easier
than the other grade!

3) Eliminates the grade crossing and collision potential all together.

Negatives:

1) The track will block a lot of access to the other track and switches
behind it. One crazy solution for that would be to have the long
straight section (that contains the grade) mounted on a long shelf that
when unlocked, can be flipped down and out towards the isle to gain
access to all those tracks and switches in the back. Use a long piano
hinge and use plywood construction to minimize dimensional shifts with
humidity and temperatures.

2) Have no idea about upper level clearances.

Anyway that my brainstorm idea...crazy huh?

Best Regards,

Mark Gurries
Linear Technology
Power Supply & Battery Charger Applications Engineer/Manager
---------------------------------------------------------
Model Railroad Club and NMRA DCC presentations are at:
http://www.siliconvalleylines.com/index.html
--------------------------------------------------------
Audio Enthusiast (Love SAE equipment)
http://members.ebay.com/aboutme/gurriesm/
----------------------------------------------------------

Re: DCC Wiring

Earl T. Hackett <hackete1@...>
 

I use toggle switches mounted below the track and actuated with a wood dowel to provide spring pressure to actuate the switch points. The dowel sticks out through the fascia so operators can easily actuate switches. Eventually the switches in interlockings will be actuated by air cylinders attached to the dowels. Switches in unsignaled areas will continue to be completely manual.

With careful track construction derailments don't happen (at least none in the last 5 years or so) and no one reaches into the layout area.

Around here DCC runs the trains, a CMRI runs the signals, and fingers do the switches.

Sure wish I had grandkids - my sons are really, REALLY slow at that stuff! I have a section of an industrial area all set up and bullet proof if some little rug rat ever shows up....

But what confuses me is how you keep track of all the button pushes to control the specific switch the train is approaching. And if you have a signal system, how do you lock out switches and integrate them with the signals?

----- Original Message -----
From: Bob Smith
To: WiringForDCC@...
Sent: Thursday, January 19, 2006 8:21 PM
Subject: [WiringForDCC] Re: DCC Wiring


>Earl
I understand what your saying, and it would be cheaper to use all
manual switches, But if the Bells and Whistles are there why not use
them? and constantly reaching into your Railroad can cause damage to
scenery, Not everyone is as careful or gentel as the owner! (You got
grandkids?)

Re: DCC Wiring

Bob Smith <bobcindy.johndeere@...>
 

--- In WiringForDCC@..., "Earl T. Hackett"
<hackete1@c...> wrote:
Earl
I understand what your saying, and it would be cheaper to use all
manual switches, But if the Bells and Whistles are there why not use
them? and constantly reaching into your Railroad can cause damage to
scenery, Not everyone is as careful or gentel as the owner! (You got
grandkids?)And I guess for me the biggest reason would be I leave
the house at 5 in the morning and get home at 8 in the evening and
except for a half hour for lunch and the ride to and from work I'm
on my feet and moving! and I do this 6 days a week! So sometimes I
like to just sit on my butt and watch things go round and round!
But on the other hand those replica ground throw are pretty cool!
Bob


I remain very confused as to why it is such a good idea to control
switches with the DCC system. With the total freedom to walk around
the layout with wireless controllers I have found simple manual
throws to be far superior to any electrical or electronic
contraption I could imagine. Maybe someone can explain why they
view this form of switch control to be so attractive.
----- Original Message -----
From: Bob Smith
To: WiringForDCC@...
Sent: Wednesday, January 18, 2006 8:12 PM
Subject: [WiringForDCC] Re: DCC Wiring


--- In WiringForDCC@..., "John M. Wallis"
<jwallis@n...>
wrote:
On top of controling the engines I have 22 switches that I would
like to control,

[Non-text portions of this message have been removed]

Re: interlocking

jerryglow2
 

The at grade crossing was a way to equalize and minimize grades.
There will be access/view panels along the facia and if I'm the only
one (or one of two) operators there shouldn't be any problem. But
you always want to design for that one case...

Jerry Glow

--- In WiringForDCC@..., "Doug Stuard" <dstuard@c...>
wrote:

Hi Jerry,

I realize that the track is already in, but I think you have
created a
huge operational problem, not just in traffic management, but in
physical access to address the derails that WILL happen.

What I would do (=<<$0.02) would be to relocate (slightly) the
ramp
going up and to the right to the INSIDE of the staging tracks and
have
it cross above the right hand staging loops at the far right side,
thereby eliminating the need for an at-grade crossing in the rear
of
the layout. The turnouts will still be there, but the whole
interlocking issue would be avoided.


Doug Stuard

Re: interlocking

Doug Stuard <dstuard@...>
 

Hi Jerry,

I realize that the track is already in, but I think you have created a
huge operational problem, not just in traffic management, but in
physical access to address the derails that WILL happen.

What I would do (=<<$0.02) would be to relocate (slightly) the ramp
going up and to the right to the INSIDE of the staging tracks and have
it cross above the right hand staging loops at the far right side,
thereby eliminating the need for an at-grade crossing in the rear of
the layout. The turnouts will still be there, but the whole
interlocking issue would be avoided.


Doug Stuard

--- In WiringForDCC@..., "jerryglow2" <jerryglow@c...>
wrote:

I am coming to a critical stage in my layout construction. The lower
level http://home.comcast.net/~jerryglow/layout/lower1.jpg is all
in
and operational and I am beginning the upper level which will in
most
cases be over the lower. The crossing at top center of the drawing
is
at grade where the tracks climb from the loops to the upper level.
Since this will all be hidden, what can (should) I do to prevent
sideswipes at the crossing?

Jerry Glow

Re: DCC Wiring

jerryglow2
 

I agree with one possible exception: the ability to set up a route
with macros. I use NCE SwitchIts to control my Tortoise machines for
the lower level of the layout which will be hidden so you can set up a
desired track with a single command. I will use more conventional
toggle switches to control the Tortoi on the upper/visible level.

Jerry Glow

--- In WiringForDCC@..., "Earl T. Hackett" <hackete1@c...>
wrote:

I remain very confused as to why it is such a good idea to control
switches with the DCC system. With the total freedom to walk around
the layout with wireless controllers I have found simple manual throws
to be far superior to any electrical or electronic contraption I could
imagine. Maybe someone can explain why they view this form of switch
control to be so attractive.

Re: interlocking

jerryglow2
 

That is not an option. All the track is in and all tracks are at the
same elevation going thru the crossing.

Jerry Glow

--- In WiringForDCC@..., "Earl T. Hackett" <hackete1@c...>
wrote:

I must admit that I did not look at the drawing before posting my
reply. Rather than get all tied up with interlocking, why not simply
put more distance between the switches that lead to the crossing and
turn it into a bridge.
Earl

Re: interlocking

Earl T. Hackett <hackete1@...>
 

I must admit that I did not look at the drawing before posting my reply. Rather than get all tied up with interlocking, why not simply put more distance between the switches that lead to the crossing and turn it into a bridge.

This situation is very different from the prototype where the engineer can see the signals so something different will be required than the usual interlocking rules. In the most basic approach, you select one route to have superiority. Then when a train enters that route, shut down everything that can interfere with that movement - not just an approach section, but the whole approach route including the yards. If the crossing is occupied, the superior route will have to be shut down until the crossing clears. You will also have to provide similar locks to prevent opposing movements on the same section of single track. Sections that trigger the interlocking will have to have their own detectors.

I posted a circuit I use to handle conditional reverse loop control in the files section. Similar logic circuits can be developed to handle this problem. If you need help in developing specific circuits, contact me off line.

----- Original Message -----
From: jerryglow2
To: WiringForDCC@...
Sent: Wednesday, January 18, 2006 7:48 PM
Subject: [WiringForDCC] Re: interlocking


To clarify, I normally run 2 units and traffic can be all 4 ways
thru the crossing
http://home.comcast.net/~jerryglow/layout/lower1.jpg

Re: DCC Wiring

Earl T. Hackett <hackete1@...>
 

I remain very confused as to why it is such a good idea to control switches with the DCC system. With the total freedom to walk around the layout with wireless controllers I have found simple manual throws to be far superior to any electrical or electronic contraption I could imagine. Maybe someone can explain why they view this form of switch control to be so attractive.

----- Original Message -----
From: Bob Smith
To: WiringForDCC@...
Sent: Wednesday, January 18, 2006 8:12 PM
Subject: [WiringForDCC] Re: DCC Wiring


--- In WiringForDCC@..., "John M. Wallis" <jwallis@n...>
wrote:
On top of controling the engines I have 22 switches that I would
like to control,

Re: DCC Wiring

Bob Smith <bobcindy.johndeere@...>
 

--- In WiringForDCC@..., "John M. Wallis" <jwallis@n...>
wrote:
Hi John
I have looked at the Digitrax system, I guess my biggest thing with
it is the limited functions it supports (basic set) and I hate the
thought of having to keep upgrading to just get to the level I am
going to need.
On top of controling the engines I have 22 switches that I would
like to control, so I think I would like to start a step ahead of
Basic, I dont know maybe I'm trying walk here before I can crawl?
Here's a question? (showing my lack of DCC knowledge here) If I
started with a Basic Set with limited functions could I control my
switches (Ihave 22 of them) with the slide switches like in block
wiring?
And again dose anyone know if Atlas Code 80 Switches are compatable
with DCC?
Thanks John for your suggestions you have given me food for thought!
I think I will take another look at Digitrax and do a little more
cost research into this system.
Thanks again Bob Smith


Hi Bob:



Since you are in N scale you should seriously consider the
Digitrax system
for your DCC. Over 87% of N scale clubs use Digitrax, which makes
it
essentially the de-facto standard for N scale. You can purchase a
Digitrax
Zephyr system for $160 from Tony's Train Exchange with similar
prices form
other mail order dealers such as Loy's Toys and Charleston Digital
Trains.



The Zephyr will easily handle your needs on the N18 layout. It is
also
fully expandable and can handle turnouts, etc.



Regards,



John Wallis



_____

From: WiringForDCC@...
[mailto:WiringForDCC@...] On
Behalf Of Bob Smith
Sent: Tuesday, January 17, 2006 12:02 PM
To: WiringForDCC@...
Subject: [WiringForDCC] DCC Wiring



Hi
Just found this site and need a few questions answered if possable?
I am in the process of building my first layout.
The Gulf Summit Lines & Susquehanna, Layout N-18 in the Atlas Nine
N Scale Railroads Book #7.
I have all the benchwork complete,the track has been layed out
positioned tacked down marked removed and am in the process of
laying
the roadbed down.
As you may have guessed I was completely new to this when I
started
into it, having purchased a starter set from a Department Store
picked
a layout out of a book and started building it with the listed
Atlas
code 80 Snap Track and Code 80 Turnouts!
Then as I started reading more about the Hobby!
I have learned of things like Flex-Track, DCC Control, ect!
So this is where my questions start?
I decided to go with DCC Control and am looking at an Prodigy
Advanced
System, Has anyone had any frist hand experiance with this unit?
Is it a good choice?
Micro Mark has it on Sale for under $200 dollors right now and it
seems
to offer good features.
My next question is about the Atlas Code 80 Switches, can these be
used
in a DCC System? I have a total of 22 of them in this layout!
which
represents a very large investment so I'm hoping they will be
compatable!
Well as this has become rather long already so stop here for now.
Thanks in advance and any help will be greatly appreciated.
Bob Smith Somerville Ohio







http://www.WiringForDCC.com




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[Non-text portions of this message have been removed]

Re: interlocking

jerryglow2
 

To clarify, I normally run 2 units and traffic can be all 4 ways
thru the crossing
http://home.comcast.net/~jerryglow/layout/lower1.jpg as trains
descend on one of the purple tracks thru the crossing and continue
down to the loops. After reversing they head back thru the crossing
up the other purple track to the upper visible portion of the
layout. All on the drawing will be concealed trackage.

Jerry Glow

--- In WiringForDCC@..., "Earl T. Hackett"
<hackete1@c...> wrote:

If the operators can not see their trains in this location, I'd
isolate a 3 ft length of rail on either side of the crossing and use
a relay to allow only one direction across the crossing to be
powered at any one time. A detector on an entrance section will
supply a logic circuit which will set and hold the relay until the
train clears the crossing. Any other train trying to enter the
crossing will simply stall on the dead track. Not great if there
are multiple head end units as some will still be pushing while the
first unit or two will just sit there, but better than crunching a
bunch of models.
----- Original Message -----
From: jerryglow2
To: WiringForDCC@...
Sent: Wednesday, January 18, 2006 9:10 AM
Subject: [WiringForDCC] interlocking


I am coming to a critical stage in my layout construction. The
lower
level http://home.comcast.net/~jerryglow/layout/lower1.jpg is
all in
and operational and I am beginning the upper level which will in
most
cases be over the lower. The crossing at top center of the
drawing is
at grade where the tracks climb from the loops to the upper
level.
Since this will all be hidden, what can (should) I do to prevent
sideswipes at the crossing?

Jerry Glow





http://www.WiringForDCC.com



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Re: interlocking

Earl T. Hackett <hackete1@...>
 

If the operators can not see their trains in this location, I'd isolate a 3 ft length of rail on either side of the crossing and use a relay to allow only one direction across the crossing to be powered at any one time. A detector on an entrance section will supply a logic circuit which will set and hold the relay until the train clears the crossing. Any other train trying to enter the crossing will simply stall on the dead track. Not great if there are multiple head end units as some will still be pushing while the first unit or two will just sit there, but better than crunching a bunch of models.

----- Original Message -----
From: jerryglow2
To: WiringForDCC@...
Sent: Wednesday, January 18, 2006 9:10 AM
Subject: [WiringForDCC] interlocking


I am coming to a critical stage in my layout construction. The lower
level http://home.comcast.net/~jerryglow/layout/lower1.jpg is all in
and operational and I am beginning the upper level which will in most
cases be over the lower. The crossing at top center of the drawing is
at grade where the tracks climb from the loops to the upper level.
Since this will all be hidden, what can (should) I do to prevent
sideswipes at the crossing?

Jerry Glow





http://www.WiringForDCC.com



SPONSORED LINKS Lionel model train European model trains Model railroads
Ho scale model train Ho model trains Model train n scale


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interlocking

jerryglow2
 

I am coming to a critical stage in my layout construction. The lower
level http://home.comcast.net/~jerryglow/layout/lower1.jpg is all in
and operational and I am beginning the upper level which will in most
cases be over the lower. The crossing at top center of the drawing is
at grade where the tracks climb from the loops to the upper level.
Since this will all be hidden, what can (should) I do to prevent
sideswipes at the crossing?

Jerry Glow

followup Re: Can't print website

jerryglow2
 

I forgot to mention: this should allow you to print it in portrait
mode.

Jerry Glow

--- In WiringForDCC@..., "jerryglow2" <jerryglow@c...>
wrote:

I just did a little experimenting. I think you can do it by
opening
the site in FrontPageExpress (or other editor) and copy the column
with the body of the article and paste it into a new document.
This
will eliminate all the sidebars and menus which make no sense in a
printed document anyway. You may have to retag the pics and
drawings
but it should work.

Jerry Glow

Re: Can't print website

jerryglow2
 

I just did a little experimenting. I think you can do it by opening
the site in FrontPageExpress (or other editor) and copy the column
with the body of the article and paste it into a new document. This
will eliminate all the sidebars and menus which make no sense in a
printed document anyway. You may have to retag the pics and drawings
but it should work.

Jerry Glow


--- In WiringForDCC@..., "wirefordcc"
<wire4dcc_admin@c...> wrote:

Does anyone have any ideas for Matt?

Matt,

I thought the last time I updated the website I had finally solved
all the printing problems. As long as your monitor was set to 800
wide, which pretty much everyone is, you should be able to print
in
portrait mode - or so I thought.

I don't have any ideas as to why your pages are printing blank. I
left your message on the forum in hopes someone else has some
ideas
for you.

All,

Matt can't print pages 3-18 of the block detection of my website.
http://www.wiringfordcc.com/blockdet.htm

Does anyone have any ideas for Matt?

Allan

Re: HELP needed

Mark Gurries
 

----- Original Message -----
From: richard_clark@...
To: WiringForDCC@...
Sent: Sunday, January 15, 2006 1:51 PM
Subject: Re: [WiringForDCC] Re: HELP needed


Hi All

If I have a short in any part of the layout how do I find it without
being able to isolate like I
could if I had conventional section switches.
Earl Hackett wrote:
Quite simply, you can't. I had the same problem, usually caused by a
mistake in a modification to the wiring. I'm presently in the midst of
installing DPDT cut out switches to break the booster sections into
manageable segments to help in tracking down those pesky shorts. The
DPDT switches arelocated on a panel mounted next to the occupancy
detectors and the local booster.

Earl is basically correct. This is also another argument for dividing
the layout in small power districts.


There are a few tricks to help you that work for me.

1) IF you hearing is good, you typically can hear the short with the
sound being strongest at the short itself if it on the track. This is
because the DCC power is AC power that runs approximately 4.5KHz to 9KHZ
range.

With NCE boosters, it cycles DCC power on and off attempting to
automatically reset itself. When it is on, you hear the buzz followed
by silence when it is off. So you have to be patient. Using my
directional sense of hearing...I usually can find the shorts quickly in
a quite room.

Shorts due to wiring do not make any noise which lead to solution #2.
Solution #2 also works on track power too.

2) The current flowing is very high...you can sometimes use a ANALOG
Volt meter set to AC mode and measure the voltage drops in your wiring.
It not the absolute voltage accuracy you are concerned about. It is the
relative readings. Was this Voltage reading less or more than the one
before? The closer you get to the short, the lower the voltage gets. I
say analog volt meter because it easier to read the peak magnitude of a
pulsing voltage. DVM reading are harder to read since they take to long
to stabilize.

Best Regards,

Mark Gurries
Linear Technology
Power Supply & Battery Charger Applications Engineer/Manager
---------------------------------------------------------
Model Railroad Club and NMRA DCC presentations are at:
http://www.siliconvalleylines.com/index.html
--------------------------------------------------------
Audio Enthusiast (Love SAE equipment)
http://members.ebay.com/aboutme/gurriesm/
----------------------------------------------------------

Re: DCC Equipped Engine Hum

Mark Gurries
 

My Bachmann Diesel came equipped with a DCC encoder. The loco makes a
humming sound on initial throttle up. Is this a power/wiring issue??
It is normal. Inexpensive DCC decoders will use a motor drive
technology that involves low audible frequencies being applied to the
motor to get it to run at slow speeds. Think Pulse Power from the DC
throttles.

Best Regards,

Mark Gurries
Linear Technology
Power Supply & Battery Charger Applications Engineer/Manager
---------------------------------------------------------
Model Railroad Club and NMRA DCC presentations are at:
http://www.siliconvalleylines.com/index.html
--------------------------------------------------------
Audio Enthusiast (Love SAE equipment)
http://members.ebay.com/aboutme/gurriesm/
----------------------------------------------------------

Re: DCC Wiring

John M. Wallis <jwallis@...>
 

Hi Bob:



Since you are in N scale you should seriously consider the Digitrax system
for your DCC. Over 87% of N scale clubs use Digitrax, which makes it
essentially the de-facto standard for N scale. You can purchase a Digitrax
Zephyr system for $160 from Tony's Train Exchange with similar prices form
other mail order dealers such as Loy's Toys and Charleston Digital Trains.



The Zephyr will easily handle your needs on the N18 layout. It is also
fully expandable and can handle turnouts, etc.



Regards,



John Wallis



_____

From: WiringForDCC@... [mailto:WiringForDCC@...] On
Behalf Of Bob Smith
Sent: Tuesday, January 17, 2006 12:02 PM
To: WiringForDCC@...
Subject: [WiringForDCC] DCC Wiring



Hi
Just found this site and need a few questions answered if possable?
I am in the process of building my first layout.
The Gulf Summit Lines & Susquehanna, Layout N-18 in the Atlas Nine
N Scale Railroads Book #7.
I have all the benchwork complete,the track has been layed out
positioned tacked down marked removed and am in the process of laying
the roadbed down.
As you may have guessed I was completely new to this when I started
into it, having purchased a starter set from a Department Store picked
a layout out of a book and started building it with the listed Atlas
code 80 Snap Track and Code 80 Turnouts!
Then as I started reading more about the Hobby!
I have learned of things like Flex-Track, DCC Control, ect!
So this is where my questions start?
I decided to go with DCC Control and am looking at an Prodigy Advanced
System, Has anyone had any frist hand experiance with this unit?
Is it a good choice?
Micro Mark has it on Sale for under $200 dollors right now and it seems
to offer good features.
My next question is about the Atlas Code 80 Switches, can these be used
in a DCC System? I have a total of 22 of them in this layout! which
represents a very large investment so I'm hoping they will be
compatable!
Well as this has become rather long already so stop here for now.
Thanks in advance and any help will be greatly appreciated.
Bob Smith Somerville Ohio







http://www.WiringForDCC.com




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DCC Wiring

Bob Smith <bobcindy.johndeere@...>
 

Hi
Just found this site and need a few questions answered if possable?
I am in the process of building my first layout.
The Gulf Summit Lines & Susquehanna, Layout N-18 in the Atlas Nine
N Scale Railroads Book #7.
I have all the benchwork complete,the track has been layed out
positioned tacked down marked removed and am in the process of laying
the roadbed down.
As you may have guessed I was completely new to this when I started
into it, having purchased a starter set from a Department Store picked
a layout out of a book and started building it with the listed Atlas
code 80 Snap Track and Code 80 Turnouts!
Then as I started reading more about the Hobby!
I have learned of things like Flex-Track, DCC Control, ect!
So this is where my questions start?
I decided to go with DCC Control and am looking at an Prodigy Advanced
System, Has anyone had any frist hand experiance with this unit?
Is it a good choice?
Micro Mark has it on Sale for under $200 dollors right now and it seems
to offer good features.
My next question is about the Atlas Code 80 Switches, can these be used
in a DCC System? I have a total of 22 of them in this layout! which
represents a very large investment so I'm hoping they will be
compatable!
Well as this has become rather long already so stop here for now.
Thanks in advance and any help will be greatly appreciated.
Bob Smith Somerville Ohio

Re: Short Protection in Yards

Vollrath, Don <dvollrath@...>
 

Allan's advice makes a lot of sense. Each operator should be isolated by mistakes of others.
Make the yard a separatly protected power district, isolated from main tracks where other operators would be working.
If the yard is double ended and worked by two operators, make each end a separate district.
Likewise, make other industrial switching areas separate districts from main tracks.
Isolating each track is overkill. If you have unknown shorts, find & fix before you attempt operating sessions.
DonV

-----Original Message-----
From: WiringForDCC@...
[mailto:WiringForDCC@...]On Behalf Of wirefordcc
Sent: Monday, January 16, 2006 8:04 PM
To: WiringForDCC@...
Subject: [WiringForDCC] Re: Short Protection in Yards


You could make the entire yard a single protected zone or you could
protect each individual turnout. In between is everything you can
imagine.

With a yard, if you get a short, you will likely know why. Chances
are you are in the middle of a movement and are staring right at the
cause of the short.

So what purpose is served by short protection? Probably the most
useful purpose is to not shut down other operators. So protecting
the whole yard as a single unit is probably enough. If you have
more than one yard operator or a double-ended yard being operated
from both ends, maybe protecting the yard as two zones is
appropriate.

Probably the second most important function served by short
protection is limiting the amount of railroad that is rendered
inoperable. Suppose you have a short and can't identify why. Or
you found the problem, but the middle of an operating sessions isn't
the time to fix it. So maybe you break your double-ended yards into
say four zones. Now if you have a short you can't fix, it only
immobilizes a portion of your yard.

You could certainly protect each individual track, but that results
in a rats nest of wiring and may not be worth it.

I hope these thoughts help.

Allan






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