I've had this mod done for about a year now. Since I don't fast travel, I use the dwemer subway mod from Mr Siika but I expanded it a lot with lots of brand new stations and lines. Changes include:

-A shuttle line (Gold Coast Line) between Anvil North and Bravil, so you could easily interchange from fast services to slow and vice-versa. Gets you to the docks and just east of Anvil.

-An epicly big Hammerfell line for TWMP Hammerfell. With a timescale of 10, you can go from Anvil North to the Imperial City in 10 in-game minutes. Also, better access from Brindlehome station to Chorrol, as it's linked to the Hammerfell line. You can even go as far as High Rock.

-A shuttle line (Alpine Line) between the Imperial City and Drakelowe, with slow services calling at Rolling Hills, Nornal Heights and Forest Green.

-An Elswood Line, calling at all of the most important settlements of Elsweyr Anequina. Interchanges are from Skingrad and the new station Elsweyr Border South. Bravil is also part of this network.

-An expanded Cyrodiil network to include places east of Imperial Bridge. Perfect if you have UL Eastern Peaks, as you would have a reliable way of getting back to wherever you need in Cyrodiil without fast travel or trekking all the way down from the Valus Mountains.

Only problem is that it's all one big plug-in, so I'm not sure how I can separate it. I want to release the mod for other people to enjoy, but I'm not sure how to split plug-ins. Any advice?