Latest developments and cost. (4000 w.) (70834)
Service record of position-light signals
R S E
1916
Ills.
Article (Journal)
English
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"Position light" signals on the Pennsylvania
Engineering Index Backfile | 1916
Position-light signals on Pennsylvania railroad
Engineering Index Backfile | 1918
The development of position-light signals
Engineering Index Backfile | 1921
|The Baltimore and Ohio railroad company color position light signals
Engineering Index Backfile | 1924
|Aluminum tank gives record service
Engineering Index Backfile | 1945