Lack of control of schedule. You live somewhere and gradually adjust your living arrangements to optimize transportation--move apartments, change jobs, find the best grocery store, etc.--but if you want to go to another grocery store, or the dentist, or the concert that's a km off your optimal trolley line, it quickly turns into a hassle.

In its prime (50ies or so in Sweden) train/bike integration appears to have worked well so that you always should be able to bring your bike. From what I have read that appears to have made slight variations less of a hassle.

asdf:

Pricing variability. Fuel prices are high and irritating. But train ticket prices can jump up due to political or economic reasons, disrupting your commuting budget for no apparent reason.

In my experience large groups of commuters are vocal and politicians that does not explain price hikes are in dangerous territory. Small groups on the other hand can get in trouble.

Sweden's finest (and perhaps only) collaborative, leftist e-newspaper Synapze.se