Hello, I'd like to install Harrogate Loop V2.3 from On-track-simulation and would like to know if the Doncaster Works Route add-on is absolutely necessary. Apart from this add-on, I have all the other required prerequisites. Perhaps someone with experience can tell me. I'd rather not buy a less-than-ideal add-on if I don't need it. What would be missing if I didn't have it? Thank you for your help. Regards, Mario