50 ont he train every day would kill you. if you missed a train you' dhave to wait ages for another. you'd constantly worry about getting home in time. you wouldn tbe able to have spontaneous nights out, you'd have to be so conscious of everything. if a train broke down you'd be buggered.
if i commuted to ucl it'd be 30 minutes by train and even that's a lot.
i just wouldn't. definitely not in my first year. second year, maybe, at a stretch.
but perhaps someone that does commute could tell you more.