As i got info form others Experimental halt is a Request halt by MP or Users to check occupancy for log distance for revenue of that train. if Occupancy is more than 70% and earning good revenue in any class for long distance that halt will considered for permanent halt by RB on Zone request. But the halt is not suppose to damage the current TT of train. if with that halt train is delaying RB after temp halt time it will cancel the halt if revenue is high also but normally temp halts not get enough berths except in GS where reservation not needed. if tickets are for less distance in GS also that halt will be cancelled.