N&W Interlocking Statistics, 1914

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>From a chart titled "Characteristics of Interlocking Plants" appearing on p. 170 of Signal Engineer, vol. 7, no. 6, June 1914. 


NIGHT COLOR INDICATIONS : 
Stop - Red 
Caution - Green 
Proceed - White 

SIGNAL LAMPS: 
Oil - 54 
Gas - 0 
Electric -3 

TRACK CIRCUITS 
AC - 38 
DC - 4 

Approach Locking - 20 
Time Locking - 20 
Route Locking - 0 
Detector Circuits - 0 
Facing Point Locks - 39 
Bolt Locks - 0 
Switch & Lock Movements - 27 
Detector Bars - 0 

Number of Hand Thrown Switches in Interlocking Limits - 0 
Number of Hand Thrown Switches in Interlocking Limits Controlled from Tower - 1 
Number of Hand Thrown Switches in Interlocking Limits Not Controlled from Tower - 21 
Number of Outlying Switches Controlled from Towers - 11 

Unfortunately, the key piece of information seems to be missing from this tabulation. Namely, just how many interlocking were in use on the N&W in 1914? 

-- abram burnett 


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