Take a look at the specifications of the trains according to their train number (as appeared in TAAG 1996)
Train No.5087
From GKP (dep.14:15) on Mon, Thu
To JAT (arr.13:00) on Tue, Fri...
more...
5088
From JAT (21:20) on Fri, Sat
To GKP (21:10) on Sat, Sun
Train No.5088A
From JAT (dep.21:20) on Tue
To BJU (arr.06.05) on Thu
Train No.5087A
From BJU (departure.04.55) on Fri
To JAT (arrival.13.00) on Sat
~Rake Link~
Rake No.1: GKP (dep.Mon) - JAT (arr./dep.Tue) - BJU (arr.Thu/dep.Fri) - JAT (arr./dep. Sat) - GKP (arr.Sat) - Repeat
Rake No.2: GKP (d.Thu) - JAT (a./d.Fri) - GKP (a.Sat)
The Rake No.2 was transferred to GHY as Amarnath Express
*Later Jammu-Barauni Express was extended to Bhagalpur