BII Railway Transportation Technology Holdings Company Limited BII Railway Transportation Technology Holdings Company Limited (1522.HK), an investment holding company and subsidiary of Beijing Infrastructure Investment (Hong Kong) Limited, specializes in intelligent rail transit system services in the People's Republic of China, encompassing investment, financing, construction, operation, and maintenance across urban rail transit lifecycles. The company operates through four segments: Intelligent Passenger Information Services, providing hardware and software such as vehicle-ground integrated passenger information systems (PIS), on-board integrated cloud platforms, comprehensive monitoring systems, and smart card automated fare collection for high-speed, intercity, suburban railways, and metros; Data and Integration Services, offering automatic fare collection/access control (AFC/ACC) systems, big data solutions, intelligent subway software, and comprehensive operation/maintenance platforms; Intelligent Infrastructure, delivering information systems for civil communication transmission, utility tunnels, and transport hubs alongside "intelligent+" services like smart construction sites, parks, and micro-centers; and Business Development Investment, managing equity stakes in railway transportation and infrastructure. Founded in 2011 and headquartered in Beijing with principal operations across 55 cities in 28 Chinese provinces/municipalities and 32 cities in 20 overseas countries/regions including recent expansions into Egypt, Chile, Netherlands, and Philippines, the company listed on the Hong Kong Stock Exchange's GEM board in 2012 before transferring to the Main Board in 2013. Recent developments include securing major contracts such as Beijing Metro Line 22 PIS and engineering communication projects, Shenyang Metro Line 3 AFC Phase I, and overseas bids like Cairo Metro Line 4 and Melipilla PIS; delivering intelligent systems for the CR450 high-speed train prototype; advancing R&D with 149 patents and 645 software copyrights as of 2024; and disposing its 49% stake in joint venture Beijing Metro Science and Technology Development Co., Ltd. for approximately HK$73.8 million in March 2025.