The transition curve depends on your car

A transition curve from the track layout review is now at least as long as your longest car. This ensures that even a long passenger car enters the curve smoothly, rather than being pushed off the track as it enters. The solution shows the assumed car length, and you can select the train there. If you’ve created your own trains in the game, the one with the longest car is preselected. If there isn’t quite enough space, the transition curve will be as long as possible, and the preview will let you know.