View single post by Huw Griffiths
 Posted: Tue Feb 4th, 2014 01:43 pm
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Huw Griffiths

Joined: Wed Oct 21st, 2009
Location: Cwmbran, Wales, United Kingdom
Posts: 261
Si. wrote: With some 'F Unit' streamlining; the double ended T could SHIFT !
Perhaps - perhaps not.

I suspect that a lot of gearboxes at the time were set up with 3 or 4 forward ratios - and 1 (very slow) ratio in reverse. I'm not sure that reversing boxes had yet been perfected - and there would have been little incentive to develop them for the road vehicles these railmotors were based on.

In later years, internal combustion engined rail vehicles became more commonplace - so manufacturers had to develop transmissions that worked forwards and backwards - but this would have been very much in the future.

As this wasn't an option then, a number of railways just coupled two single ended railmotors back to back - so the one at the front dragged the other one along. Well known examples include the "Ford T" and "Shefflex" style railmotors that found their way onto some of the Colonel Stephens railways:

Examples of "back to back" railmotors, on the Colonel Stephens Society website.

 A number of similar vehicles also found their way onto some minor railways in Ireland.

In later years, one German manufacturer came up with a slightly more developed version of this idea - with the engines, drivetrains and bonnets of two Ford AA (or BB) trucks being fitted to one chassis - and a passenger saloon in the middle. I am, of course, talking about the Wismar Railbus.

Anyway, that's enough from me. Back to the interesting stuff - the trains (especially the unusual ones) - and the photos of them.



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