I'm sorry to say even though i live in the Northeast i haven't been on much. Not even the NYC subway system.
Systems so far
PATH System every line at least 2x
Hudson-Bergen LR at least 15x
NJT Rail 4 lines and about 30x
Amtrak Keystone 1x
Patco 1x
By the end of this year
Baltimore Light Rail
Amtrak Northeast Regional to DC
DC Metro
NYC subways at least 5 lines
Metro-North New Haven line
Septa > Tram , Regional Rail , and Subway-EL
Amtrak Regional to Boston
ACES (Atlantic City Express)
Amtrak Keystone 2x