Section 165(9) in The West Bengal Motor Vehicles Rules, 1989
(9)The weight in kilograms of goods, exclusive of the luggage and personal effects of passengers carried on a Stage Carriage shall not exceed (N-X) x 150 where in relation to a single-decked Stage Carriage or to the lower deck of a double-decked Stage Carriage.Explanation. - N is the registered passenger seating capacity of the vehicle and X is the number of passengers carried on the vehicle or the number of passenger for whom seats are kept free and unimpeded by goods whichever is greater.