[modeleng] Re: Steam loco configurations

>Another question however - on the 2-6-4's and 4-6-2's that I have been 
looking at, I cannot sort out how the skeleton 2-wheel bogey works. Is it 
just on a trailing arm, or is there a vertical rstraint as well please?<
It depends. The GWR used a pony truck consisting of relatively thin bars, 
which had a tendency to bend easily. Gibson in his book is very critical -
says it's like a set of pony reigns on a buggy that Abe Lincoln would have 
driven! He describes at some length the problems in Swindon works in 
straightening them out after 
even minor derailments on bad track. The trailing truck on the Gresley 
Pacifics, on the other hand, was a pretty substantial affair with Cartazzi 
axleboxes. These are on 
inclined plane slides such that as they move further across horizontally, 
the inclined plane offers and increasing returning force. I don't know 
what practice the LMS followed 
under Stanier. Webb, on the LNWR, went for radial axleboxes on his pony 
trucks. In all cases, there is some weight taken to the truck, the actual 
amount depending on the 
desired weight distribution, and to some extent, the settling of the 
springs.

Peter Chadwick
Swindon


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