The English code adopted by the principal railroads as issued by the London and Northwestern R. R.
Railroad block signal rules
RR Gaz
1895
Aufsatz (Zeitschrift)
Englisch
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Sykes block railroad signal apparatus
Engineering Index Backfile | 1890
Hall block railroad signal on the N. Y. Central
Engineering Index Backfile | 1890
Electrical block railroad signals
Engineering Index Backfile | 1890
|Standard rules for railroad signaling
Engineering Index Backfile | 1895