The best train fm Delhi to Goa is Goa Sampark Kranti Express and this is super fast train.I used this train in past and was in 2nd AC.Details are as below.
SNo Stn Code Stn Name Route No. Arrival Time Dep. Time Distance Day
1 NZM H NIZAMUDDIN 1 Source 07:30 0 1
2 KOTA KOTA JN 1 13:20 13:30 458 1
3 BRC VADODARA JN 1 22:00 22:18 986 1
4 BSR VASAI ROAD 1 03:45 03:50 1330 2
5 PNVL PANVEL 1 05:10 05:15 1397 2
6 RN RATNAGIRI 1 10:15 10:20 1759 2
7 PERN PERNEM 1 13:20 13:22 2014 2
8 THVM THIVIM 1 13:37 13:39 2029 2
9 KRMI KARMALI 1 13:58 14:00 2054 2
10 MAO MADGAON 1 15:00 Destination 2094 2
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Fair for 2nd AC fm Delhi to Madgaon is
Class -- 1A Class -- 2A Class -- 3A Class -- SL
Base Fare 2334 1356 961 341
Reservation Charges 35 25 25 20
Superfast Charges 50 30 30 20
Other Charges 0 0 0 0
Total Amount 2419 >1411< 1016 381
for more info go to this site,
http://www.indianrail.gov.in/