Are fantasy maps allowed on this forum? Because I just made one.
See it here.
The general concept is a reconfiguration and expansion of the existing L system into 5
metro-style "L" lines, and a rework of the Metra network into 4 RER-style Regional "R". All lines run through the CBD. There are no frequency-limiting reverse branch bottlenecks - every line gets a two-track route through the core, but there is some proper branching at the outer ends of some of the lines. To the greatest degree possible, things are laid out to enable a two-seat ride from anywhere to almost anywhere.
There is no rhyme or reason to where I stopped drawing the commuter lines. I basically stopped when I felt I had drawn far enough to show my point.
Some parts are pretty foamy. Others are big but would probably be worth the investment. I tried to rely on existing infrastructure and rights-of-way, and base it on plans that actually exist in the real world, as much as possible.
Probably the two biggest items are:
1. Two new regional rail tunnels heading north from Millennium Station. One connects to the MD-N and NCS via Carroll Street, and the other connects to the UP-N via Streeterville and Chicago Ave. The UP-N, MD-N, and NCS would all be electrified at 1500VDC so they can use the tunnels and for compatibility.
2. The Brown Line wound up turning into a 40 mile "super loop" (Yikes, foam alert.) The only part of the brown line that is recognizable is the part where it already has its own route starting at Roscoe/Sheffield. Yeah, I know, it's a bit out of control. Its route, heading east from Roscoe/Sheffield, is:
(1) A new Lincoln Park Subway. East on Roscoe, South on Broadway and then Larrabee
(2) Clinton/Larrabee Subway under the North Branch
(3) West Loop Transportation Center
(4) St Charles Air Line through the South Loop
(5) IC Freight tracks through McCormick Place and Hyde Park, to 63rd
(6) West along the Green Line branches along 63rd, extended to Midway
(7) North up the Mid-City Transitway to Montrose
(8) East in a subway under Lawrence to the existing terminus.
Other things of note:
-The loop is de-looped by mothballing and/or removing the southern (Van Buren) segment.
-Tower 18 is reduced to a diamond where the Pink and Green lines cross each other, with no switching operations, and could (possibly?) be grade-separated.
-The Pink Line (formerly known as Purple) becomes a through route by taking over the Rock Island right-of-way from Lasalle to 18th, where it enters the Dan Ryan line
-Ogilvie and LaSalle stations cease to exist and their train sheds are made available for redevelopment.
-Rock Island trains are diverted to Union Station and run through to the MD-W and UP-W lines via Union Station run-through tracks.
-The BNSF is connected to UP-NW via Union Station.
-Intercity trains use the WLTC concept, with new through tracks under Clinton or Canal.
-The current yellow line is operated as an extension of the Red Line (basically, this frees up its color to be used on a Regional line.)
-The Metra Electric South Chicago branch is taken over by a southward extension of the Green Line. This would probably require rolling stock with dual current collection by both 3rd rail and pantograph, similar to the former configuration of the Skokie Swift.
-I was not really sure what to do with the Forest Park branch (current Pink Line). I just kept it as a branch of the Green Line.