Quote:
Originally Posted by JSH
When you physically connect the vehicles they legally become one vehicle that exceeds legal length limits.
Given the fact that trying to get the NHTSA to update headlight and mirror requirements has been a decades of banging one’s head against a brick wall I’m not hopeful for a change to length limits.
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It would require clarification but from what I read on the Interstate highway system at least, there is no overall length limit. With 20 cars and a tug you would be over the weight limit which makes less sense as it is carried by at least 84 tires over a large area. Scaling down the trains to 12 cars and a tug should be under 80,000 pounds and the overall length would be more manageable. The economy would suffer though.
https://ops.fhwa.dot.gov/freight/sw/overview/index.htm