Hump / Classification

Building a train…
In the hump yard – cars are sent over the hump to roll downhill. Radar and automatic retarders built into the tracks control the rolling speed. Computers operate switches to direct each car to an appropriate string of cars with the ultimate destination in mind. The goal is for the car to carry enough speed to successfully couple with the string. Too little speed – and a pusher engine will have to be summoned to make the connection – shutting down the operation. Too much speed – will result in damage or derailment. Each string of cars represents an outbound train heading in the same direction.