1) More leg space 2) Depending on train you have a small desk so laptop work is possible and comfortable 3) I don't get travel sick on trains while working 4

1) More leg space 2) Depending on train you have a small desk so laptop work is possible and comfortable 3) I don't get travel sick on trains while working 4) Toilets are large, many 5) Bar/restaurant on board? 6) On-off boarding usually happens in city center (From personal experience, not in U.S.)