Curved linear rail with 3-wheeled carriage 2

A 3-wheeled carriage is pushed by hand along a rail consisting of two oval-shaped bars. At curved portions of the rail the contact between the bars and the rollers is not good. However, it does not cause problems for the carriage motion. System of 3 rollers helps keeping the carriage direction stable during motion. This video was made based on: Inventor files of this video: