A pilot mechanism for improving operation of various functions of the pneumatic brake of a train. The mechanism includes solenoid valves, controllable by either a radio/battery mode of operation or a train wire system mode of operation. The solenoid valves can be interposed in various passages in fluid communication with passages of a conventional ABD control valve, as modified to enable operation of the invention, to permit substantially immediate venting of air in those passages to atmosphere.
This is continuation of application Ser. No. 08/102,303 filed on Feb. 2, 1993, now U.S. Pat. No. 5,390,988, which is a continuation-in-part of application Ser. No. 07/829,927 filed on Feb. 4, 1992, abandoned.
