A conductor (North American English) or guard (Commonwealth English) is a train crew member responsible for operational and safety duties that do not involve actual operation of the train/locomotive. The conductor title is most common in North American railway operations, but the role is common worldwide under various job titles. In Commonwealth English, a conductor is also known as guard or train manager. The responsibilities of a conductor or guard typically include the following: Conductor is also a crew member in some bus, trolleybus or tram operations.