Well, that's only going to work if there's enough underground space for railways to turn 45° before entering the station. Judging from what I've seen, most "im

Well, that's only going to work if there's enough underground space for railways to turn 45° before entering the station. Judging from what I've seen, most "important" transfer stations are in an urban district where railroads follow existing roads, so curving them would send the lines underneath existing buildings, making it more expensive and also slower (trains don't like to turn, after all).