Abstract: China Railway Chengdu Bureau Group Co., Ltd. (referred to as Chengdu Bureau) has many railway tunnels in mountainous areas and complex lines within the hubs. The infrastructure inspection cars have some common problems such as low positioning accuracy, inability to provide effective mileage rectification with GPS signals throughout the whole inspection process, tedious and laborious operations of manual mileage rectification and line changing. The article proposes a design of a general-purpose automatic position rectification equipment for railway infrastructure inspection cars based on ocomotive LKJ operation data. The equipment consists of a front-end onboard device installed on the locomotive, an LKJ operation data receiving device installed on the inspection car, and a suite of comprehensive positioning data processing software. The equipment can obtain real-time operation data from the locomotive 's LKJ equipment, transmit it to the inspection car via wireless communication, complete line changing and mileage correction automatically and provide precise position rectification data for the inspection car. This equipment is suitable for various specialty infrastructure inspection cars assigned by Chengdu Bureau, and easy and fast to install. At present, the equipment has undergone preliminary dynamic testing on one signal and comminications inspection car and one OCS inspection car, basically meeting the design requirements, improving the intelligence level of infrastructure inspection cars, and helping to improve the quality and efficiency of inspection operations.