Show cogwheel trains on the map when they are associated with a ski area

[Russell Porter]

It's probably a bit difficult to accurately determine which trains are used for skiing, but a starting point would be to add cogwheel trains (in addition to previously added funiculars).

For both cogwheel/funiculars, we could add a postprocessing step in the processor to remove them from the map if they are not associated with a ski run in the feature graph.