That's not special. My dad's old Peugoet 205 used to take that long to preheatAlso, yes, some trains do have keys, but also starting the engine on a diesel loco, you need to press the start button down for a few seconds, and even then, the engine will not just burst into life, you need to wait for it to prime, which can take the best part of about 15 or 20 seconds!