79

D.—l

Table IV. is a comparison which shows: First, the ratio existing between the resistances of lines A, B, and C, a grade of 1 in 200 being taken as a grade of double power (see Wellington); second, the resistances by the formula; third, the fuel needed for the service per train mile, as taken from Tables 1., 11., and 111., with that for the line C prorated to the full weight of train.

Table IV.

These comparisons justify the conclusions as to cost of motive power on these lines, and suggest that line B should, in practice, prove more favourable than shown by these computations. Cost per Assistant-engine Mile. The cost of wages, plus one-tenth of all the other items that make up the cost of the engine mile, is the cost per mile for the distance not run by the assistant engine (see Wellington), and which is given in Table V. in amount and per cent, of the road-engine mile.

Table V. —Assistant-engine Cost standing with Steam up for Distance not run, per Mile.

The assistant-engine average daily mileage on the several lines will be as shown in Table VI., that for line B being based on an assistant-engine mileage from Otira to the summit and return. For all lines except B the assistant-engine mileage is the same as the train mileage, while for B it is assumed that the assistant engine will be cut out at the summit, returning thence to Otira.

Table VI.—Average Daily Mileage of Assistant Engines.

Putting the values found in Tables V. and VI. in the formula for cost of assistant engine per train mile, 1 + ( 80 ~ m ) p, where m is the variable average daily mileage from Table VI., and p is the per cent, or ratio from Table V., the costs in pence of Table VII. result.

Table VII.—Cost of Assistant Engine per Train Mile in Pence.

Lines. Ratios. A. B. C. = a. b. c. 'eet per mile plus 26-4 6-40 7-25 900 = 1 1-13 1-41 26-4" lesistance by formula 'uel consumed 67 00 12-06 76-50 14-90 9610 = 1 18-52 = 1 114 1-235 1-43 1-53

Type of Engine. Pence. Per Cent. Remarks. B B 85-ton 90-ton 5-35 5-49 5-98 606 34-1 32-1 27-2 26-6 | For line A. For other lines.

Annual Trains each way. Line A. Line B. Line C. Line 01. Line E. Line F. 500 700 1,000 ... 340 477 681 27-4 38-3 54-7 18-6 261 37-3 25-6 35-9 51-3 17-5 24-5 35-0 33-8 47-4 67-7 230 32-3 461 34-8 48-7 69-5 23-6 33-2 47-4 340 47-5 680 231 32-4 46-3 33-9 474 67-8 23-0 32-3 46-2

Type of Engine. Trains per Annum. Line A. Line B. Line C. Line 01. Line E. Line F. B ... i5-ton 10-tOH .. 500 700 1,000 340 477 681 500 700 1,000 340 477 681 500 700 1,000 25-9 21-5 18-1 35-2 28-4 23-4 234 19-5 16-5 30-7 25-2 21-1 30-2 26-1 230 36-8 30-8 26-3 30-2 24-8 20-9 29-8 25-8 22-9 36-2 30-4 26-1 24-5 20-8 181 300 260 230 30-1 26-1 230 35-3 28-9 24-2 30-9 26-9 23-8