WMATA pulse code or CSX/NS pulse code? WMATA pulse code seems to de-motor and max service brake to zero mph before the driver can "re-motor". Its a problem around interlockings or merges. Station platform has a high speed code (45 mph), right at the platform edge, or 1 foot outside the station, there is a 0 mph code, driver full throttle accelerates out of the station, basically full service brake inducter hit 10 feet outside the platform, 60-100 feet later train is standing still for 5-15 seconds with first car in the tunnel, rear 4-5 cars still on platform, at 0 mph the beeping stops, and a 30 or 45 code the train gets and then accelerates away like normal. There is no alerter button to "acknowledge" and prevent a penalty brake mainline RR style and coast no motors until below the speed code for the block.
Your argument is based on the assumption that the train control system was designed for full time manual operation. Fact is it was designed for full time automatic operation. The train board automatic systems responds more gracefully to loss of speed commands then can be done by an operator in manual mode.
There is no such thing as a '0 mph code', the transmission of no speed commands or the receiving of no speed commands (loss of speed commands) is a fail safe that bring a train to a stop in both automatic or manual mode.
John in the sand box of Maryland's eastern shore.