[JoshTriplett]

I enjoy traveling by train, but I'd never want to commute by train. Even if you can use the time for something else, you're still pre-committing to spend that time in transit, which changes the effective workday from ~8-9 hours (counting lunch) to ~11-12 hours. It doesn't matter that that isn't "work" time; it's still time that's pre-committed and constrained. That makes a substantial difference in how much free time you have that's not spent in transit.