China Railway Encyclopedia--Communicatiion and signal

China Railway Encyclopedia is the first modern trade encyclopedia and divided into five parts: transportation and economy,rolling stock and electrification and signal ,synthesis.At present three are published:transportation and economy,engineering and working,communication and signal.Transportation and Economy is made up of railage and economy,includes nine branches and have 654 entries.Communication,railway signal is composed of railway communication ,railway signal and information technology,18 branches ,1040 entries .Engineering and working includes railway engineering and railway working ,ten branches 10008 entries .The bool popularly ,systematically ,scientifically and roundly expatiates basic knowledge of the theories ,practice experience,history evolution and development trend of the branches .It can be used as a reference by the railway managers ,technicians ,college teachers and students,railway employees and many readers to learn and disburse