The Railroad Conductor is the profession of the manager of a train and its crew. The conductor is responsible for all areas other than the engine, which is the responsibility of the Railroad Engineer. He makes sure all the freight is secure, and the train is cleared to move down the track. He signals the engineer when to start and stop the train. On passenger trains, the conductor also announces the route of the train, gives the "all aboard" and collects the passengers' tickets. (On large trains, the collection may be done by an assistant conductor.) While railroads were in their prime in the United States, the conductor traditionally rode in the last car of a train, the caboose. Modern trains have largely made the caboose obsolete, and the conductor is based near the front of the train.