Simply Maya User Community - View Single Post - Why Train goes slower on the corners of curve?

Hi everybody. I have a problem. Could someone help me about that please? Why Train goes slower on the corners of curve?
I create a reference curve for train road. And I used Joint Tool to rig my train. And than, I used IK Spline Handle Tool to attach my train on my curve. But when my train goes on the corner of curve it is getting slower. Why? I have rendered it but result was not changed... Thank you... user added image

This is my problem: https://www.youtube.com/embed/6AG8TtsKHSo