Salem-Beverly project, involving remote control of two outlying junction layouts, formerly handled by mechanical interlockings; high-voltage lead storage batteries for operation of switch machines; a-c primary system used for outlying track circuits and signals.
Interlockings combined on Boston and Maine
Ry Signaling
Railway Signaling ; 28 , n 12 ; p 631-634
1935
4 pages
Aufsatz (Zeitschrift)
Englisch
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Boston and Maine consolidates interlockings and C.T.C.
Engineering Index Backfile | 1948
Engineering Index Backfile | 1938
Engineering Index Backfile | 1938
Semi-automatic interlockings on Boston elevated
Engineering Index Backfile | 1937
|Engineering Index Backfile | 1933