जिंदगी में शादी के अलावा ट्रेन में RAC ही एक ऐसी स्थिति है,जिसमें दो अजनबी साथ निभाने को मजबूर होते है। - Junaid

Instead of booking in advance, you can keep track of the seat availability from your mobile and buy the tickets when you arrive. It will save you time and risk because train may get late.
Though availability of buses on this route is never a problem.

---