Most train servicing depots which I have been involved, not a lot happens during daylight as all the stock is out running trains and so they do look boring.
Where they come into they own is overnight where there is never a dull moment. Some of them will fuel, service, clean up to 20 mainline sets a night in a period of 6 to 8 hours. Trust me you do not stop with constant movement throughout the night. And then if there are problems, there will be shunts and reformations of the sets. It was always a satisfying as the sun was rising to stand and watch the trains being preped and realising what you and your team and actually achieved overnight!
Glenn and Graham through Aberdeen Kirkhall have tried to give a flavour of what a real modern train servicing depot is like. The attention to detail is fantastic but the operating sequence is quite a challenge (just like the real thing!) and it is a fantastic layout to watch. Oh and with DCC it is possible to do some "stunts" which you cann't do with dc. The obvious is the train engine following the stock down the arrival road once released but also to have the morning departures queuing at the departure signal; the next one moving up as the one in front is moving off just like the real thing.
If you get a chance to see it in the flesh do come and have a look; also come and chat to the operators and find out what it is really about.
Richard