Traveller should take Ranakpur Express to reach Jodhpur. Stay at Jodhpur for 2 days and then take train from Jodhpur to Jaisalmer. Ranakpur Express is nice train but no place to even stand in sleeper class during vacation so will prefer 3 A/C or A/C coach if possible.
I travelled in AC 3 tier. Overall travelling was nice, toilets are clean. Just that food is not good in the train so, I would suggest you to carry some good home made food. Seats are in good condition. Stations were ok. Eatables were available at the station.
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