Abstract: An improved anchor structure for use with concrete railroad ties. A modular base plate is cast into the concrete tie with integral upwardly projecting shoulders extending from the base plate which complement it to present a seat to support a steel railroad rail. An anchoring portion is also integral with each shoulder and extends downwardly to anchor the device in the tie. The shoulder also presents an opening for receiving a retaining spring clip. A resilient rubber or fiber pad is disposed on the seat between the rail and the base plate. The pad is characterized by laterally projecting tabs which abut the bridging portion on either side to preclude lateral movement of the pad. The retaining spring clip engages the rail base and also has a leg projecting through the opening. A curvilinear portion of the clip complementally engages an arcuate segment of the briding portion while a second leg is disposed in a groove presented by the bridging portion.