Dreaming of a train with a fixed frequency running on the track usually symbolizes that the plan is going smoothly or according to plan.
Dreaming that the train is accelerating indicates that the plan will be realized smoothly.
I dreamed that I was driving a train, and I knew the route.
It means that you are dealing with things in a familiar way and think that things are under control. But this "security" is actually unintentional. Once an accident happens, it will have serious consequences.