The Right Stretch of the Rhine would be great. Ideally, it would be on the same map as the Left Rhine Route and not as a separate route (although this might not be possible).
The route runs for around 110 km mostly directly along the right bank of the Rhine and has around 31 train stations. The 1440 series (Alstom Coradia Continental) and the 429 series (Stadler Flirt) operate there as regional trains. The 425 series can also be found. The route is not served as scheduled by long-distance traffic, only individual special trips (but if there are disruptions on the left Rhine route, they will be rerouted here).