I live in patna and I have used railway wifi many times, so I can say surely that it’s running very nice. It’s maintain speed almost 1 MB for very first hour, so you can say it’s very efficient for your internet needs.
I already traveled jodhpur just last month and also used there wifi, but I feel that some speed difference. Speed is little a bit high here by 1.4 mbps.
After all good service by railway.