NYC subway used like that too. Didn't look at schedules, just hopped on and off at whatever station. Didn't feel like crossing under the east river in a tunnel

NYC subway used like that too. Didn't look at schedules, just hopped on and off at whatever station. Didn't feel like crossing under the east river in a tunnel so hopped off a red train and switched to a yellow train to use a bridge instead. All on a whim.