What were the books on the principles of railway construction?
For books on the principles of railway construction, you can refer to the following examples: <<1>><</strong>> A comprehensive railway design manual that covers all aspects of railway design, including railway lines, bridges, tunnels, stations, freight, passenger transport, rail vehicles, etc. 2. Code for the Design of Railroad Lines: This was the Chinese national standard, Code for the Design of Railroad Lines. It was a standard code for the design of railway lines, including the structure of railway lines, geological conditions, line length, track structure, bridge design, etc. Bridge Design Manual: This is a standard manual for bridge design, covering all aspects of bridge design, including bridge structure, geological conditions, structural design, construction management, etc. Tunnel Design Manual: This is a standard manual for tunnel design, covering various aspects of tunnel design, including tunnel structure, geological conditions, structural design, drainage, ventilation, fire protection, etc. "Design Manual of Rolling Cars": This is a standard manual for the design of rolling cars, covering all aspects of rolling cars, including car construction, performance indicators, car maintenance, rail car maintenance, etc. Code for Investigation and Design of Railroad Engineering: This is the Chinese national standard, Code for Investigation and Design of Railroad Engineering. It is a standard code for the investigation and design of railway engineering, including the design requirements of railway lines, bridges, tunnels, stations, freight, passenger transport, rail vehicles, etc.