slip coach

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun rail transport A coach at the end of a long-distance train which carries passengers for an intermediate destination and is decoupled or "slipped" and left behind. (In bygone times the decoupling was done on the move; the rest of the train did not stop.)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a railway car at the end of the train; it can be detached without stopping the train