I recently had a job working at a small rail yard. Few people realize how large and heavy trains actually are. We transferred product from railcar to semi trucks every day. The length of an 18 wheeler from bumper to bumper is about the length of your average railcar. A standard railcar can haul about 4 - 4.5 times the amount a semi truck can legally haul. A modern railcar can have a max weight (including the empty weight) of about 286,000 pounds. (about 129.7 metric tons).