53181. The first priniples of railway signalling : including an account of the legislation in the United Kingdom affecting the working of railways and the provision of signalling and safety appliances / by C.B. Byles. - London : The Railway Gazette [etc.], 1910. 146, [18] p. : ill. : 19 cm. - PK : NS O 91

53181. The first priniples of railway signalling : including an account of the legislation in the United Kingdom affecting the working of railways and the provision of signalling and safety appliances / by C.B. Byles. - London : The Railway Gazette [etc.], 1910. 146, [18] p. : ill. : 19 cm. - PK : NS O 91