A good route. As Bikaner is linked to the Capital of the state there is enough demand. With the same rake, the train can come back too. But check the timings with Leelan Express. Here is the link:
/train/timetable/706/117/272#st . The route of your train maybe different, even then end to end demand may not be there. I dont know what is your reason for having B1 and B2 in a 6 hour journey. The fare will be higher than CC and so may not be popular with commuters