Just a small addition to the Ruhr-Sieg line: The branch line from Letmathe to Iserlohn, just 5 km in length. This is the destination of the one-car-trains you see at Hagen.
I was kinda disappointed when I first noticed this short stretch of rails wasn't featured in RSN, and as they have made the one car trains run to Letmathe, why not continuing this little route? Great idea, I would like to see this make its entry in RSN!
What would make this even more interesting of course is, if they released the Abellio Flirt that runs on the Ruhr-Sieg-Line nowadays. Iserlohn is now served by running a two-unit train (3-car+2-car Flirt) depart from Hagen, then at Letmathe the two cars get uncoupled, with the 3-car going to Siegen and the 2-car branching off to Iserlohn. On the return journey it's just the other way round: The two meet at Letmathe, are coupled and proceed to Hagen.
