It means that even if in the station, there is NO revenue generation or NO footfalls in the category [ie less than that NSG4 category], that Tourist spot Rly Station or Junction Rly Station may be classified as NSG4 by GM of particular Zone; Example in SWR is that DDS DWF Dudhsagar Rly Station, LIM Sonalium Rly Station may be categorised as NSG4 even if there are no footfalls (meaning no passengers boarding/ deboarding) or no revenue generation (no high value tickets issued), as it is a tourist spot and requires extra facilities more than basic amenities ...