Roadside Station Waiting List (RSWL) is allotted when berths or seats are booked by the originating station for journeys up to the road-side station and distance restrictions may not apply. This waiting list has also very less chances of confirmation.
What is RSWL in Railway reservation?
RLWL stands for Remote Location Waiting List. The Indian Railways allocates the seats based upon what locations most people book tickets for, in a given train. Also, seats are allotted between destinations which are more frequented.
Consider a train Jamnagar-Jamu Tawi Express (12477). Let us consider that all the seats are booked and the RACs are also taken up. So the Railways would start issuing tickets with Waiting Lists. Now, the railways issue waiting lists tickets only when there is a possibility of it getting confirmed.
Now, if I book a ticket from Jamnagar to say Ambala Cantt. I would get a RLWL as it is a ticket that very few people would book for, but if I book a ticket from Ahmedabad Junction to Ratlam Junction then I would get WL as many people would book for these.
Also, the chances of RLWL and WL getting confirmed are different.
PS. Example for explanatory purpose only.