Re: MDC Moose Jaws Loco
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I intended to recommend a PCB retainer plate and wipers on the drivers, but several corespondents have already done so. The advantage of driver wipers is that they do not reduce tractive effort as rail wipers do, and the locomotive's occasional slipping keeps the drivers cleaner than idler wheels. Very light pressure on a very small contact area will give good electrical contact without adding much drag.
Incidentally, there is a sort of prototype for your ?-8-4t: The Costa Rica Ry used inside framed 2-6-0s for road service, and outside framed 0-6-4Ts for helpers. They had 4 from Baldwin (1892-6), and 1 from Nasmyth-Wilson in 1900. These were side tank engines of 3'6" gauge. There's a photograph and dimensions for the Baldwin, as built, in Modern Locomotives 1900, entry #141, p 201 & 221, at