Human factors in signalling systems; specific applications to railway signalling,

מאת Mashour, M.
יצא לאור 1974

Railway operating and signalling techniques in Europe, Japan and the United States of America : report.

יצא לאור 1954

Notes on permanent-way material, platelaying, and points & crossings : with a few remarks on signalling and interlocking /

מאת Cole, W. H. (William Henry), 1854-1916
יצא לאור 1903