Hello Guys. İ set up my blueprint like in screenshot. its simple scene two carriage following spline. The problem is i m
increasing carriage location on spline same amount but as seen as in video distance between carriages are changeing.
Foto: https://drive.google.com/file/d/0B-igqNbmWEgqVk04YWdqMVRjT2c/view?usp=sharing
video: https://drive.google.com/file/d/0B-igqNbmWEgqaUIza0VYNHdUck0/view?usp=sharing
thankyou 
Ok i found the solution i changed spline type to linear