HQI has accumulated and mastered various technical principles throughout the 20-year development of rolling stock market, including protocols such as RS485, RS422, SIP, CAN, Modbus, MVR, TRDP, UIC568, and Ethernet. It has a thorough understanding of the electrical characteristics of various interfaces, such as M12, DB9, Harting, Phoenix, MVB, WAGO, Souriau and so on.

HQI's solutions support compatibility with the cable systems of existing vehicles and involve customized product structures tailored to the original installation space. Relying on the complete supply chain system in the Chinese market, HQI has built a secure supply guarantee capability.

Moreover, HQI is familiar with the technical characteristics of major global rolling stock manufacturers and has successfully completed projects such as CRRC vehicle modification, Delhi (India) dynamic map modification, and vehicle CCTV system modification in the Middle East.

HQI's solutions help customers address issues with the Passenger Information System (PIS) of existing vehicles, enhance the performance of the PIS, improve passengers' travel experience, and effectively control modification costs—achieving maximum results with minimal funds and resources.