As many have said before, as a train driver (even though I drive in another country) I too would say that any 3 year old can set the train in motion. But to truly master the train, including all things and rules that comes with it... that is a different kind of story.
To be honest, that's the part I like most. The unexpected things. Every day is a different day and every day, you learn something new.
To give an example of things that could happen (short story):
We had some stormy weather yesterday in the Netherlands. I was driving the Intercity service from The Hague to Eindhoven. It was after the city of Breda, towards Tilburg, that a few interesting things happened. Heavy rain obstructed my view outside to the outside. Even the windscreen wipers couldn't manage. I was driving at approximately 87 mph/140 km/h. Signals were barely visible, but thanks to my route knowledge, I knew exactly were I was: just a few miles outside the station of Gilze-Rijen.
Then, all of a sudden, my safety system (the Dutch ATB system) drops from green to yellow, as a warning that the next signal could be at danger.
As I pull the brakes, I see a signal at danger passing by.
I just had a SPAD. How could this happen?
Before I come to a complete stop, I already informed the train manager about what happend and raised an alarm to the signaller that I passed a signal at danger.
I was sure I didn't miss any signals and therefor it had to be either a signal fault or my path was deliberately revoked by the signaller due to an obstruction on the line ahead.
The signaller was not amused. "That bloody thing again," he muttered, before telling me it was a faulty signal, that was supposed to be fixed days ago. He asked if I was able to drive, or that a relief driver was necessary. I told him that I was good to go and I got permission to proceed at caution to the next signal.
After informing the train manager, I drove the train slowly to the next signal, which showed a nice green light and I picked up speed again, to arrive at the station of Tilburg, delayed only by a few minutes.
This is just an example from another day at the office, and I think it's a good example of how a normal day can quickly turn into something slightly different.
Driving a train is easy, but it's not only the driving itself that matters.