| 摘要 |
A system for controlling brakes on a rail or light rail motive power unit, in which the brakes are provided with a pneumatic braking system including a pneumatic main pipe and a pneumatic brake pipe. The system includes a control unit, manually operated actuating devices, a relay valve interposed between the pneumatic main pipe and the brake pipe, an electro-pneumatic control unit operable under the control of the unit to supply a variable braking control pressure, pneumatic back-up devices operable under the control of the actuating devices to supply a pneumatic back-up pressure which can be used to control the braking, and an enabling valve which can be switched between a normal operating condition and a back-up operating condition in which it can connect a control inlet of the relay valve selectively to the outlet of the electropneumatic unit or to the back-up devices.
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