Added February 2021
WEIGHT DISTRIBUTION
Since writing the original piece about weight distribution, we have built another nine locos. Here is a complete list of all engines and their weights. All measurements are in grams.
I have also devised a method to measure their effective drawbar force. This consists of a length of small chain, which rests on my small scales on the floor. The chain is attached to the loco with a length of thread over a pulley. With the engine on a metre length of track, it pulls the chain upwards until the loco starts slipping and cannot lift any more chain. The difference in weight between the whole chain and what is left resting on the scales is the drawbar force. The diagram should make this clear.
WEIGHT DISTRIBUTION
Since writing the original piece about weight distribution, we have built another nine locos. Here is a complete list of all engines and their weights. All measurements are in grams.
I have also devised a method to measure their effective drawbar force. This consists of a length of small chain, which rests on my small scales on the floor. The chain is attached to the loco with a length of thread over a pulley. With the engine on a metre length of track, it pulls the chain upwards until the loco starts slipping and cannot lift any more chain. The difference in weight between the whole chain and what is left resting on the scales is the drawbar force. The diagram should make this clear.
THREE AXLE LOCOS
Leading
2nd
Trailing
Tractive wt
Total
A1
82
2-4-0
37
66
60
126
163
A1
655
0-6-0
39
58
40
131
131
A1
662
0-6-0
40
48
53
141
141
A1X
678
0-6-0
39
57
45
141
141
D1
234
0-4-2
68
62
110
130
239
D1
239
0-4-2
51
83
74
123
208
D1
241
0-4-2
83
63
75
146
221
D1
297
0-4-2
47
60
85
107
193
E1
86
0-6-0
50
66
72
188
188
E1
100
0-6-0
64
82
97
243
243
E1
109
0-6-0
37
60
72
169
169
E1
135
0-6-0
61
113
93
267
267
FOUR AXLE LOCOS
Leading
2nd
3rd
Trailing
Tractive wt
Total
D3
365
0-4-4
82
106
43
42
188
273
D3
373
0-4-4
70
93
45
48
163
256
E3
165
0-6-2
72
96
69
75
237
312
E4
468
0-6-2
78
77
70
73
225
298
E4
566
0-6-2
69
71
83
66
223
289
E4X
165
0-6-2
80
46
60
58
186
244
E5
584
0-6-2
65
81
45
55
191
246
E6
410
0-6-2
72
93
45
68
210
278
INDUSTRIAL
Leading
Trailing
Total
Manning-Wardle
‘Titan’
0-4-0
43
31
74
Neilson
‘Orion’
0-4-0
29
51
80
Black Hawthorn
‘Ajax’
0-4-0
27
55
82
Hawthorn Leslie
‘Leviathan’
0-4-0
29
65
94
TENDER ENGINES
Locomotive
Tender
Leading
2nd
3rd
4th
Tractive wt
Total
D’bar
weight
weight
1st
2nd
3rd
Total
B1
184
4-2-0
68
104
12
-
172
184
9
10
22
25
57
B4
64
4-4-0
28
30
106
86
192
250
56
6
43
42
91
C
405
0-6-0
63
67
43
-
173
173
11
11
34
31
76
C1
427
0-6-0
57
61
36
-
154
154
7
9
31
36
76
C2
522
0-6-0
62
64
64
-
190
190
28
6
28
38
72
D2
308
0-4-2
58
72
30
-
130
160
11
11
30
33
74
G
323
2-2-2
48
125
36
-
125
209
25
4
31
32
66
FIVE AXLE LOCOS
Leading
2nd
3rd
4th
Trailing
Tractive wt
Total
I2
13
4-4-2
40
48
100
79
78
179
345
I3
22
4-4-2
45
44
94
72
98
166
353
