[TakeFive]

2018 Annual rail boardings

By route from highest to lowest:

1. A Line - 7,052,646
2. H Line - 4,967,909
3. E Line - 4,496,104
4. W Line - 4,324,483
5. D Line - 3,343,264
6. F Line - 2,925,490
7. C Line - 2,588,344
8. R Line - 1,835,109
9. B Line - 566,943

By corridor from highest to lowest

1. SE Corridor (E & F Lines) - 7,421,594
2. Airport Corridor (A Line) - 7,052,646
3. I-225 Corridor (H & R Lines) - 6,803,018
4. SW Corridor (C & D Lines) - 5,931,608
5. West Corridor (W Line) - 4,324,483
6. NW Corridor (B Line) - 566,943

Note: Interestingly the A Line and the R Line have the same exact subsidy per boarding. Clearly the A Line needs to be substantially shortened.

Logically, the G and W Lines could be considered as a West 'corridor' even though they're separate.