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Arva, Ontario | Ray,
An 'A' train is one which uses a 'converter dolly' to create the train. Best example for you is the typical UPS/Roadway arrangement with the lead trailer, convertor dolly, then the pup.
A 'B' train is only two units with the suspension of the lead hanging out back far enough that you put a 5th wheel plate on it, and back it under the pup. The advantage of these is that you have one less 'pivot point', and they can be backed up and backed around corners with a bit/a lot of practice. Ed Boysun's hoppers are B trains.
Typically up here in the bulk commodity business, most 'A' trains are dumps, and B trains are hoppers. There is usually an air actuated locking pin on the 5th wheel of the converter dolly on A trains to eliminate one pivot point for backing up.
Oh, and to totally confuse the issue. If we have a straight truck pulling a trailer using a converter dolly, we call the towed unit a pup. If it is a 'rigid' unit on a ball or pintle hitch, we refer to it as a 'pony'.
I'll try to link/post some examples to help sort this out.
Luke aka Ken SWOnt | |
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Take a look at travel on a Russian Interstate
