China Railway comprehensive inspection trains

China Railway comprehensive inspection trains, or CITs, are high-speed test trains used on the high-speed rail network of China and the Jakarta-Bandung High Speed Rail in Indonesia are normally owned and operated by China Railway or the China Academy of Railway Sciences (CARS) and Kereta Cepat Indonesia China.

CIT trains are equipped with special devices to monitor the conditions of the track, the wheel-rail force, a catenary-pantograph communications system, and a signal system. Stock is usually painted with yellow bands and the words "高速综合检测列车" (meaning "High-speed Comprehensive Inspection Train") are usually painted on the side. The designs of most CITs are based on originally commercial designs, like the CIT001 (based on CRH5) and CIT400A (based on CRH380A). However, the CIT380A trainset was converted from a prototype of CRH380A (CRH2-150C). Some re-vamped commercial trains used for testing purposes are not designated as CITs and have standard serial numbers appended with a "J" (e.g. CRH380AJ). This stands for "Jiǎn" (inspection).

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