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(last edited July 18, 2005) Front Page | Recent Changes | Title Index | User Preferences | Random Page | HelpA form of electro-pneumatic brake, normally restricted to multiple unit trains, which uses a single train wire to control the braking on each vehicle. The brake commands consist of pulses of electricity applied to the wire, a continuous signal denoting brake release and a loss of signal an emergency brake application. The brake control valve on each vehicle detects the length of the pulses and provides air input to the brake cylinders accordingly. The air supply is from the main reservoir pipe.
The analogue e-p brake system requires no brake pipe and the brake commands can be generated by a driver's brake controller or an automatic train driving system (ATO). It is also known as PWM (pulse width modulation) control or P-wire for short.
