In an electric rail system including a current collector mounted for movement along at least one rail of the electric rail system and configured to draw current from the at least one rail, a monitoring system comprising at least one sensor selected from the group consisting of:
- a camera configured to record images of a portion of the at least one rail in front of the current collector or behind the current collector relative to a movement direction of the current collector along the rail;
- at least one vibration sensor on at least one slip contact of the current collector,
- an optical spark sensor configured to detect sparks in a contact region between the slip contact and the at least one rail, and
- at least one distance sensor configured to detect a distance between the at least one distance sensor and the at least one rail.