If I am travelling on a train (departs at 6pm from my place) to a state that's 608 KM away from mine, can I pray Maghrib and Isha the next day?

I am travelling on a train that travels for 12 hours. It starts from my state before Maghrib and reaches the destination the next day after Fajr. Will my salah still be valid if I pray my missed Maghrib and Isha the next day along with Fajr? Edit: Considering that it's almost difficult to pray in the train, will my salah still be valid if I pray my missed Maghrib and Isha the next day along with Fajr?