of coke per mile run.
Hence, calculating the cost in the same way, for a distance run of 312
miles in a week--
L s. d.
Wages of stoker of stationary engine. 1 0 0
Coke, 52 cwt. at 25s. per ton. 2 15 0
Oil, 1 gallon at 3s. 1d. 0 3 1
Waste, 4 lb. at 2d. 0 0 8
Depreciation on stationary engine, 10 per cent. }
on L300 11s. 6d. }
Depreciation of electrical apparatus, 15 per cent. } 2 0 4
on L500, L1 8s. 10d. }
---------
Total. L5 19 1
A saving of over 25 per cent.
The total mileage run is very small, on account of the light traffic
early in the year. Heavier traffic will tell very much in favor of the
electric car, as the loss due to leakage will be a much smaller
proportion of the total power developed.
It will be observed that the cost of the tramway engines is very much
in excess of what is usual on other lines, but this is entirely
accounted for by the high price of coke, and the exceedingly difficult
nature of the line to work, on account of the curves and gradients.
These causes send up the cost of electrical working in the same ratio,
hence the comparison is valid as between the steam and electricity,
but it would be unsafe to compare the cost of either with
horse-traction or wire-rope traction on other lines.
Pages:
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64