Select the unfrozen coaster (the hidden one) in the Coaster tab. Then go to Coaster properties -> Script -> Add. Class Path -> Select the Reverchon directory Script Class -> Select the ReverchonMaster script
Is it possible to add a custom car? If so, where can I get a download link? Talking about your problem, the solution is to change the settings a bit. First, you should select the hidden coaster in the Coaster tab. There in the scripts file, you will find an Add button. From the Class path, select the Reverchon directory and add the ReverchonMaster script. By the way, what you did is impressive. I hope that db fahrplan also has such a developed plan, down to the smallest detail, so the train lines work perfectly.