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A small air reservoir in a locomotive control stand. When the automatic brake valve is operated, this reservoir responds by reducing or increasing the air pressure in the brake pipe. [81] Event recorder A device that continuously captures analog and digital train systems information and stores that data for a minimum of 48 hours.
It is typically used to connect a fluid line to a rigid, internally threaded hydraulic component. The bolt is assembled through the center of the union, usually with face seals on either side of the union, to create a fluid path between the external ports on the union and bolt. A flexible hose or a rigid pipe may be connected to the union port. [1]
A comparatively simple brake linkage. In the air brake's simplest form, called the straight air system, compressed air pushes on a piston in a cylinder. The piston is connected through mechanical linkage to brake shoes that can rub on the train wheels, using the resulting friction to slow the train.
The earliest type of continuous brake was the chain brake [19] which used a chain, running the length of the train, to operate brakes on all vehicles simultaneously. The chain brake was soon superseded by air-operated or vacuum operated brakes. These brakes used hoses connecting all the wagons of a train, so the operator could apply or release ...
The trailer brake consists of a direct two-line system: the supply line and the separate control or service line. The supply line receives air from the prime mover park brake air tank via a park brake relay valve and the control line is regulated via the trailer-brake relay valve. The operating signals for the relay are provided by the prime ...
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