Mechanical.

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Bibliographic Details
Other Authors: Challis, W. H., Such, W. H., Champion, Donald L.
Format: Book
Language:English
Published: London, UK : IRSE, [2008]
Series:British Railway signalling practice.
Subjects:
British Railways.
Railroads > Great Britain > Signaling.
Railroads > Great Britain > Signaling > Interlocking systems.
Railroads > Electric equipment > Great Britain.
Railroads > Great Britain > Communication systems.
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