1922.] 
Jenkinson.—Development of the Locomotive. 
297 
Table II.— Summary of Locomotive Tests, Wellington-Taihape Express Service. 
Ab 658, Simple Superheated ; Weight, 75 tons. 
(4th to 12th September, 1916.) 
Trip. 
Gross 
Ton- 
mileage. 
Actual 
Run¬ 
ning- 
time. 
Water 
per 
Journey. 
Coal per 
Round Trip. 
Per Ton-mile. 
Weather. 
* 
Water. 
Coal. 
N. 
S. 
N. 
S. 
N. 
S. 
N. 
S. 
Average 
53.200 
55.200 
49,600 
52,550 
49.200 
56,650 
53,850 
55,800 
Mins. 
327 
318 
328 
332 
337 
325 
336 
333 
Gallons. 
5,085 
3,710 
4,910 
3,440 
4,070 
3,600 
4,935 
3,455 
lb. 
j 10,416 | 
j 11,228 | 
| 11,788 £ 
] 11,312 £ 
Gallons. 
•096 
•067 
•099 
• 65 
•083 
•063 
•091 
•062 
lb. 
] -096 £ 
L u °{ 
}™{ 
! - 103 i 
N.W gale. 
Fair. 
N.W. gale. 
Calm. 
Calm. 
S. gale. 
N.W. gale. 
S. gale. 
53,260 
330 
4,150 
5,593 
•078 
•105 
A 598, Compound Saturated ; Weight, 69 tons. 
(15th to 21st September, 1916.) 
Trip. 
Gross 
Ton- 
mileage. 
Actual 
Run¬ 
ning- 
time. 
Water 
per 
Journey. 
Coal per 
Round Trip. 
Per Ton-mile. 
Weather. 
Water. 
Coal. 
N. 
S. 
N. 
S. 
N. 
S. 
Average 
44.260 
48,860 
50.260 
55,900 
41,025 
51,855 
Mins. 
340 
339 
341 
327 
345 
300 
Gallons. 
4,720 
4,280 
5,230 
4,710 
4,430 
4,515 
lb. 
j 11,844 | 
| 12,684 £ 
] 10,836 £ 
Gallons. 
•107 
•088 
•104 
•084 
•108 
•087 
lb. 
] -127 
| -119 
} ' 117 
Calm. 
Calm. 
Calm. 
48,700 
332 
4,648 
5,894 
•095 
•121 
Ab 658. 
A 598. 
Coal per engine-mile 
(lb.) 
35-0 
36-8 
Coal per ton-mile 
(lb.) 
0 105 
0-121 
Water per engine-mile 
(gall.) 
260 
28-0 
Water per ton-mile 
(lb.) 
0-78 
095 
Ton-miles per pound coal . . 
9-7 
8-26 
Ton-miles per pound water 
1-28 
P05 
Pounds of water evaporated 
from and at 
212° F. per pound coal 
9-84 
9-52 
658 saves 13-2 per cent, coal and 
17-9 per cent. 
water over 
:V 598. 
Each engine was assisted Wellington-Johnsonville on north trip : in addition 
A 598 was assisted Marton--Taihape on 15th September, 1916; Paekakariki-Wellington 
on 19th and 21st September, 1916 ; and Palmerston North-Taihape on 20th September, 
1916. 
Coal accurately weighed and water measured by meter. 
