1.Best option is 12977 Marusagar Exp direct to Jaipur.
2. Most Delhi bound train halt at SWM, and take connecting train to JP which is just 130 Kms.
3. Alternatively if money is no problem then book Jet Airways flight 9W434 + 9W2053 via BOM booked on a single PNR so that airline can accommodate you to some other flight if there is cancellation or delays.