Underground Tram Station
In my Central City I had a major interchange (called City Centre) with 4 busy trams lines converging on one subway station.
Originally, all four tram lines shared a small loop - but as the lines got busier and the trams got longer, this let to delays in service. The original solution was to build new tram lines in the road and have the trams circle the block, a distribute the trams to two stops, with the busiest line having a dedicated stop. The old tram loop was converted to public walkways and the tram lines removed. Even with double tram tracks, peak hours saw a lot of congestion and delays. The city decided the only solution was to build an underground tram terminus. This included a new tram subway from a portal just west that would serve the two lines entering from the west. New passenger walkways to connect them to the surface and subway. Two of the tram lines serve the subway stops while the other two remain on the surface.
In this picture you can see the pedestrian entrance to the underground tram loops. Also can see non-revenue track disconnected on the road at the bottom of the picture - a remnant of the old loop. The second westbound track is used by Line 201 to bypass the stop for the 203 seen to the left. And the southbound centre track is used by the 203; the northbound track is no longer used.
http://flic.kr/p/e9uvRd
And this is the underground view. I used bus lanes with tram tracks and sidewalks for the station, bus lanes without for some of the tunnel and metro track for most of the tunnelled section. You can see how the pedestrian walkway connects to the tram stations.
http://flic.kr/p/e9oQ2a
Here is the west portal for the underground tram line. The street sections of tram track is no longer in revenue service as all trams are now diverted to the tunnel; however, it is kept in place for stock movement and can be used when the tunnel is closed for maintenance or other reasons.
As way of DLC or mod, I'd love to see some smaller pedestrian walkways if the engine can handle them, such as stairs, escalators and elevators. Also love to be able to connect the metro using walkways etc. And it would be great if we could locate the station entrance to where we want it, not just automatic and maybe have multiple station entrances.
http://flic.kr/p/e9uGTh