thats impossible tell me how you acheived this I only managed to get the steam locomotive which I call the flying scotsman up to 199KPM no higher. I also took a high speed locomotive up to a top speed with 8 passenger carriages to 270 with an electric locomotive to give it the extra boost it needs to help it. also to achieve both these high speeds you need accelerate down a straight stretch of track otherwise your train goes flying through the air and making friends with the hard grass.