Track layout and mechanical interlocking which has been in service for 46 yr on Boston and Maine replaced by modern electrical equipment and controls; illustrated description of dwarf signals, electric switch machines, panel type control machine, and switch circuits.
Boston and Maine installs all-relay interlocking at Concord, N.H.
Ry Signaling
Railway Signaling ; 38 , n 5
1945
Article (Journal)
English
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Engineering Index Backfile | 1898
All relay interlocking expedites traffic on Boston and Maine
Engineering Index Backfile | 1931
|Concord shops -- Boston and Maine railroad
Engineering Index Backfile | 1898
Concord shops -- Boston and Maine railroad
Engineering Index Backfile | 1898