Dirk gave me the help. It was the friction wheels I didn't turn on at the brakesection

Hi there. I'm new to this forum. I've just made a great version of the old rollercoaster "Rutschebanen" from the amusementpark Bakken in Denmark, but I got a problem with the cars. The rollercoaster has two sets cars, and the front cars start as it suppose to do, but the next line of cars does not s...