Posted by john in la on January 14, 2023 at 13:36:42 from (97.80.68.11):
In Reply to: clearing snow. posted by rustred on January 14, 2023 at 09:03:43:
An A train is what you commonly see in the US and Australia. The hitching point for the second trailer is an A shaped dolly that comes off the back of the front trailer. The A shape gives it a single hitch point to the front trailer. The only difference between the US and Australia is the US limits the trailer size to 28 feet in most states and only 2 trailers.
On a B train the rear axles of the front trailer and the hitch point of the rear trailer are on one frame. While legal a couple of things make them unpractical in the US. Bridge weight laws and most that pull doubles in the US use box trailers. Kind of hard to get a box trailer to a dock with the front trailer of a B train. Sysco experimented with a B train that the axels slide under the front trailer. Does not work well with the 28 foot trailer length in the US so only practical in Mich and Wa that allows longer trailers. Canada uses B trains a lot because it reduces a pivot point of the A train.
Then there is the C train. It uses a dolly like the A train but has 2 connection points to the front trailer behind each frame rail. This makes the dolly ridged to the front trailer about like a B train. It gives the axle spread you need for US bridge laws and eliminates the problem getting the front trailer of a B train to the dock while eliminating a pivot point so on paper it was a good idea. But it is very hard to hook up because of the dual hook points and wears tires badly from dragging the extra tire spread around turns so no one uses them.
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