So you have to make sure that the speed of the launch section itself is set to 125 mph as well as in the kit settings. Furthermore the train will only accelerated until the catchcar reached the rollout. When the catchcar reached the rollout the train is not accelerated anymore and will be slowed down by air drag. Further make sure that the forced rollback panel is not on and the rollback probability is not set to 100 in the settings. I hope some of this was the issue. If not let me know and tell me what the block state is (shown in the F4 panel) when the slow down of the train starts

I set the speed to 125mph but it slows down when it exits the launch 20% less than the nearest speed, which is now 108mph. How to solve this?

Thanks to all :)

I love it how you automaticly make a roll back and having the computer do the maintance work for you.

we should get a top hat preset (okay, i dont know how to build one)

This is awesome!