Patent ID: 7434895

Claim:
A controller for an equalizing reservoir of a rail brake system which includes a brake pipe controlled by a relay valve in response to pressure in the equalizing reservoir, the controller comprising: an electro-pneumatic source of pressure or atmosphere responsive to an electrical equalizing pressure control signal; a first pilot valve selectively connecting the electro-pneumatic source of pressure or atmosphere at a first input or connecting a second input to the equalizing reservoir in response to pressure in a pilot port of the first pilot valve; a first magnetic valve having a first input connected to a second source of pressure, a second input connected to atmosphere and an output connected to the pilot port of the first pilot valve; a penalty valve connected to the pilot port of the first pilot valve and responsive to a penalty signal to connect the pilot port to atmosphere; a second pilot valve having a pilot port connected to the pilot port of the first pilot valve, having a first input, and having an output connected to a third source of pressure lower than pressure in the equalizing reservoir prior to a penalty signal, the second pilot valve connecting the second pilot valve's first input to the second pilot valve's output in response to a penalty signal; and a second magnetic valve selectively connecting the second input of the first pilot valve to the first input of the second pilot valve.