I know a transit operator working on the spare board who finished at 2 AM Monday (really Tuesday morning) and was told to report at 4 AM Wednesday morning. Try that on your body clock!
In the railroad industry, THAT would be against the federal law (FRA). So, are NOT the transit organizations subject to the same federal laws that railroads, Amtrak, and commuter rail operations are subject to?
Rapid-transit operators aren't, for whatever reason. At one time NYC Transit (i.e. the subway operation) had a maximum hours-of-service above that of FRA-regulated train crews like that of the LIRR and Metro-North. I don't know for certain whether that has been amended since then.
---PCJ