I made some 1/1 replacements of the paper version that you get std with your carrera GO set. If the rail is to big, just use a soldering iron or similar to melt them together. I printed 0.4mm thick in PETG but other materials should work as well.

As an experiment I also made a hard railing that clicks onto the track. This works good in my opinion, print out 2 of them if you want to try and see difference with the original ones.