This doubled as an emergency brake. This is akin to letting off the emergency brake a bit. They have a service brake and an emergency brake. They were also available with manual transmission and a foot-operated emergency brake. If the train passes any of these at more than the emergency brake is applied. The train crew applied the emergency brake. The indications are called into Monorail Central with the emergency brake pressures. The mechanism of an emergency brake may differ, depending on railcar design. Failure to receive any of these codes resulted in the emergency brake operating. Some event recorders feature outputs controlling penalty brake or emergency brake (train) systems, and speedometers. The dashboard mounted emergency brake gripped the rear discs directly. The emergency brake acts directly on the bullwheel. "The lower gears can be used as an emergency brake". Clara applies the emergency brake and returns to town. Unusually, the handbrake or emergency brake operated on the front wheels.