I have to ask, is it possible?????

Hey Guys,

Many times, I see people take cycles/bikes in a DEMU train when I was in my hometown (GRD but I had to catch the train to HWH from MDP).

I was curious at that time, can people take their cycles/bikes to longer distances. Not in a DEMU, but in a express train, obviously not in second class/AC compartment somewhere like those coaches in the last which says "LUGGAGE"??? Do they have to do some paperwork for that beforehand????