2100 hours
Car 56 flashed under a crossover and into a long , gentle curve . The chronometer clicked up to 2100 hours and the radio sang out . `` Cars 207 , 56 and 82 , this is Pitt Control . 2100 hours density report follows ... '' Pittsburgh Control read off the figures for the three cars . Car 82 was one hundred fifty miles ahead of Beulah , Car 207 about the same distance to the rear . The density report ended and a new voice came on the air . `` Attention all cars and all stations , this is Washington Criminal Control . ''