An O.C.P. rate, short for Overland Common Point rate, is a transportation rate applied to goods transported by rail or truck between inland points. It refers to the charges levied for the transportation of cargo from one common point, such as an inland terminal or rail yard, to another common point. O.C.P. rates are typically negotiated between carriers and shippers and can vary based on factors such as distance, weight, volume, and the specific transportation mode used.