I don't know how train engineers do it... Having to memorise every signal, crossing, curve, gradient, switch, siding, station, etc along their route. On top of that they're hauling a mile and a half long of freight. Ntm railroad trains don't brake like subway cars. When the engineer applys air, all the cars will not brake at the same time. The air travles down the train line (brake pipe, connected by air hoses between cars) at 800 ft per second. So in other words, if your train was 8000 ft long, the last car won't start braking 'till ten seconds later. You don't want your intial brake to be too hard resulting in the cars crashing into each other. Use the wrong combination of brakes and you can break the train apart. Use the airbrakes over a long period of time and you'll end up with a runaway. Very stresful job to say the least...