... with trucks... that weigh hundreds of HUNDREDS of thousands of pounds less than a train (literally just the locomotive weighs 400 THOUSAND pounds/200 short tons, even a land train in australia has a maximum weight of 164 short tons). It's like saying "why don't bicycles have seatbelts when cars are required to". The car seatbelts are for collisions with other things at speed. A bike/car collision at 90 degrees is much more worrisome for the bike than the car.
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