Abstract: In response to the lack of unified reference and digital demonstration of construction technology standards and process requirements in railway communication, signal, power and electrification (referred to as "four electricity") engineering construction, this paper studied the first article digital calibration of railway four electricity, and conducted research on digital modeling, data analysis, process simulation and other technologies in the construction project of Lanzhou-Zhangye high-speed railway. In terms of equipment, materials, processes, etc., the paper organically combined these technologies with the construction specifications, maintenance standards, and other aspects of construction projects, formed a digital and template based high-quality digital model project. The application shows that digital calibration can more accurately grasp various parameters and indicators in the construction process, accurately predict and evaluate potential risks in the construction process, improve the construction quality and efficiency of railway four electricity engineering, and further promote the digital application of railway four electricity construction technology.