Just a suggestion.....
If the slot is for Karmabhoomi, then either it should be changed after Sealdah or the slot sharing should start from Sealdah. Because BWN to SDAH will take 01h50m and SDAH to KGP will take 02h05m. Thus, 30 minutes more is required, which is not possible if this type of slot sharing is there.
The train is good but the slot is not.