[mhays]

You'll need a lot more than rail to approach those cities in transit commute share -- a multiple of other types of transit commutes too. Metro commute shares from 2019 ACS:
-DC: 13.1%
-Chicago: 12.4%
-LA: 4.8%

While we're at it:
-Atlanta: 2.8%
-Baltimore: 5.9%
-Boston: 13.4%
-Dallas: 1.3%
-Denver: 4.5%
-Detroit: 1.4%
-Houston: 2.0%
-Miami: 2.9%
-MSP: 4.5%
-NY: 31.6%
-Philly: 9.4%
-Phoenix: 1.8%
-Pittsburgh: 6.0%
-Portland: 6.7%
-SD: 2.8%
-SF: 18.9% (& 4.7% SJ)
-Seattle: 10.7%