Automatic signal and interlocking protection at the government drawbridge at Rock Island, Ill. (1000 w.) (74384)
Special protection for a drawbridge
Ry Age Gaz
1916
Ills.
Article (Journal)
English
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Spring-derail for drawbridge protection
Engineering Index Backfile | 1934
Engineering Index Backfile | 1911
|Engineering Index Backfile | 1929
Engineering Index Backfile | 1929
|Automatic interlocking for drawbridge
Engineering Index Backfile | 1933