Re: OFF TOPIC German narrow gauge



On 02/01/2016 12:44, chapmanmchapman@... [LRRSA] wrote:
I beg to differ.
I don't think this can be regarded a true articulation, as found on Mallet or Beyer-Garratt locos. It is more a system to give a bit more flexibility and side-ways movement to the outer coupled axles.

These type of "bogies" (Krauss-Helmholtz, etc.) actually consist of a linkage between the pony-trucks and their adjacent coupled axles to push the driving axles a bit sideways and so ease its passage through sharp curves. They were often used on long-wheelbase, coupled locos in Europe, although I don't think they were much used here or the rest of the "English-speaking" world. The Germans also tried out various types of "flexible-wheelbase" locos, such a Luttermoller and Klein-Lindner, in which the end axles did actually pivot a bit on curves; there was no actual axle-pivoting in the Krauss-Helmholtz system.

There is no actual "hinge" between two groups of coupled wheels, to allow them to take up an angle to each other, as in true articulated locos.

Brian Rumary

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