That was not Through Service but through tickets issued as Bombay Mail (1884 Pic 1)
1. Bombay-JBP-ALD, ALD-GZB-Lahore-Peshawar (LHR since 1870, 1875-76 Pic 2, 1888-89 Pic 3). This continued later for through traffic from JBP/STA etc to Delhi/Punjab!!
2. Bombay-ADI, ADI-DLI (MG), ADI-AGC (MG), AGC/DLI-Lahore-Peshawar (Pic 4 1888-1889)