Classification yard

Rail yard used for sorting and assembling rail cars into trains

A classification yard, marshalling yard or shunting yard is a railway yard found at some freight train stations, used to separate railway cars onto one of several tracks. First, the cars are taken to a track, sometimes called a lead or a drill. From there, the cars are sent through a series of switches called a ladder onto the classification tracks. Larger yards tend to put the lead on an artificially built hill called a hump to use the force of gravity to propel the cars through the ladder.

This keyword could refer to multiple things. Here are some suggestions: