Harper's patent interlocking block telegraphs, for the prevention of errors in signalling trains ...
Subtitle: also, Stroudley's patent intercommunication in trains
Published: 1882
Place of publication: London
Language: eng
Number of pages: 23
Subjects: Railroads; Signaling; Interlocking system
Other titles: Harper's patent interlocking block telegraphs, for the prevention of errors in signalling trains ... ; also, Stroudley's patent intercommunication in trains; Stroudley's patent intercommunication in trains.