Despite unmatched advantage in speed, the maglev has not gained widespread use in China's high-speed rail network due to high cost, German refusal to share technology and concerns about safety. The price tag of the Shanghai Maglev was believed to be $ billion and was partially financed by the German government. The refusal of the Transrapid Consortium to share technology and source production in China made large-scale maglev production much more costly than high-speed train technology for conventional lines. Finally, residents living along the proposed maglev route have raised health concerns about noise and electromagnetic radiation emitted by the trains, despite an environmental assessment by the Shanghai Academy of Environmental Sciences saying the line was safe.  These concerns have prevented the construction of the proposed extension of the maglev to Hangzhou . Even the more modest plan to extend the maglev to Shanghai's other airport, Hongqiao , has stalled. Instead, a conventional subway line was built to connect the two airports, and a conventional high-speed rail line was built between Shanghai and Hangzhou .