Here is something I learnt.
The special to BGM doesn't go empty to UBL (as many commented here) , but stays at Desur I think.
See this video by Mr. Shridhar Hulikavi.
It is going towards UBL, but he gets off at Desur. That means it is not stopping at Desur just like that.... but halts there itself on Sat, Sun...
more... and then returns to BGM on Sunday evening.
.
I wish railfans like him joined IRI. An active railfan who posts so many videos from BGM - a place from where we don't get much railfanning pics, videos.
Maybe he doesn't know about IRI.
Hope someone comments in his video about IRI and he joins IRI and posts more videos here :)