There are 5 platforms at Gwalior :-
PF1. For trains going towards JHS/BPL.
PF2. For trains going towards AGC/NZM/NDLS. (Sometimes used for JHS/BPL bound train if PF1 is not empty)
PF3. For JHS or AGC bound trains originating/terminating from/to GWL (Barauni-GWL, Bundelkhand). Also used for train which is changing direction (JHS-Bandra Exp).
PF4....
more... For trains going on ETW-GUNA section. Also used for some Delhi bound trains like Karnataka Exp., DDR-ASR Exp, etc.
PF5. Narrow Gauge platform.