To my knowledge they just interact with each other for safety problems and their measures ..
Hindi is the official language but they can also chat on native language if they know ..
At station premises they chat regarding ..
Brake pass certificate, proper vaccum level..various tsr or psr enroute ..
Any...
more... medic issues and more ..
They also interact and give real time status when their duty shift changes to new staff or to each other..
So that new comers can get the knowledge and run train safely.
And normal gossips also happen.
Heard many times.