most of my life the railroads ran on standard time only, and didn't give a fig for the bizdroid's silliness of so called daylight savings time. i don't know what year they finally resigned them selves to bowing to it, if they did, other then maybe amtrak itself when that came in, but i do know all through the 60s, and well into the 70s, trains, timetables, dispatching, all that opperating side of railroading ran all year round on standard time, right through the rest of mundania playing that silliness with resetting their clocks twice a year.