Section 693(b) in Police Regulations, Bengal , 1943
(b)Railway bridges, in common with other railway goods and premises, will ordinarily be protected by watchmen in the employ of the railway concerned. In the event of the replacement of these watchmen by police guards -(i)when the services of the police guards are placed at the disposal of the railway at the request of the railway administration, the cost of the guards will fall upon the railway;(ii)if the substitution is made on general grounds of State policy and the service is taken over by the police as part of its regular duties, the charges will fall upon the Provincial Government and will be debited to police.
