The truck was modified 4 years ago to a truck which can run along rails. The wheels have been removed to fit the vehicle to the rails, and it can obtain a Maximum speed is of 30 mph. The idea came up in 1998, when Mr. Zhao was in Henan. In 2006 in order to improve work efficiency, in spite of being apparently weird, the idea came true.
Source: Sichuan Online - Huaxi Dushi Bao via cinaoggi