The ornamental design for a locomotive, as shown and described.
1. Locomotive
1.1 : Perspective
1.2 : Enlarged view of a driver's cabin
1.3 : Front
1.4 : Back
1.5 : Side view
1.6 : Top
An industrial design for a locomotive for moving trains or individual wagons along a track; it comprises the following structural elements: a body consisting of a frame accommodating hoods, the driver's cabin with rear-view mirrors, and handrails, the frame installed on locomotive bogies with wheel pairs, and a fuel tank located between the bogies.