264 POWER DISTRIBUTION FOR ELECTRIC RAILROADS. 
In a sample month of operation, locomotive No. I 
ran 5168 miles in regular service, hauled through the 
tunnel 375,000 tens in trains averaging a little over 1000 
tons apiece, and did this at a total cost for labor, fuel, 
maintenance and incidentals, of $2186. 
This means a cost of 0.58 cent per ton actually hauled, 
Or 42.3 cente per engine mile. But with the three locomo- 
tives now in service, the labor expense at the power house 
is unincreased, while the other expenses increase with the 
   
    
   
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FIG. 138, 
number of locomotives in service. T‘he result is greatly to 
reduce the cost per engine mile, probably to between 
twenty-five and thirty cents. ‘T‘he cost per engine mile for 
the freight service of one of the large steam railroad sys- 
tems is stated to be on the average 26.1 cents., varying on 
the different sections between twenty-three and thirty-four 
cents, so that the electric traction does not differ notably in 
cost from steam haulage, in spite of the fact that the station 
is necessarily somewhat uneconomical from the frequent 
periods of light load. The coal consumption during the