Train Timing, Page 3: - Speed Measurement Table.
The table below shows the times (in seconds) required to cover ¼, ½ and 1 mile at speeds ranging from 10 to 140 mph. For example, at a constant 79 mph it will take 11.39 seconds for ¼ mile, 22.78 seconds for ½ mile and 45.57 seconds for 1 mile.
(If you assume that the distances are in kilometres instead of miles, then the same table can be used for speeds in kph.)
Seconds per:
mph ¼ m ½ m 1 m
10 90.00 180.00 360.00
11 81.82 163.64 327.27
12 75.00 150.00 300.00
13 69.23 138.46 276.92
14 64.29 128.57 257.14
15 60.00 120.00 240.00
16 56.25 112.50 225.00
17 52.94 105.88 211.76
18 50.00 100.00 200.00
19 47.37 94.74 189.47
20 45.00 90.00 180.00
21 42.86 85.71 171.43
22 40.91 81.82 163.64
23 39.13 78.26 156.52
24 37.50 75.00 150.00
25 36.00 72.00 144.00
26 34.62 69.23 138.46
27 33.33 66.67 133.33
28 32.14 64.29 128.57
29 31.03 62.07 124.14
30 30.00 60.00 120.00
31 29.03 58.06 116.13
32 28.13 56.25 112.50
33 27.27 54.55 109.09
34 26.47 52.94 105.88
35 25.71 51.43 102.86
36 25.00 50.00 100.00
37 24.32 48.65 97.30
38 23.68 47.37 94.74
39 23.08 46.15 92.31
40 22.50 45.00 90.00
41 21.95 43.90 87.80
42 21.43 42.86 85.71
43 20.93 41.86 83.72
44 20.45 40.91 81.82
45 20.00 40.00 80.00
46 19.57 39.13 78.26
47 19.15 38.30 76.60
48 18.75 37.50 75.00
49 18.37 36.73 73.47
50 18.00 36.00 72.00
51 17.65 35.29 70.59
52 17.31 34.62 69.23
53 16.98 33.96 67.92
54 16.67 33.33 66.67
55 16.36 32.73 65.45
56 16.07 32.14 64.29
57 15.79 31.58 63.16
58 15.52 31.03 62.07
59 15.25 30.51 61.02
60 15.00 30.00 60.00
61 14.75 29.51 59.02
62 14.52 29.03 58.06
63 14.29 28.57 57.14
64 14.06 28.13 56.25
65 13.85 27.69 55.38
66 13.64 27.27 54.55
67 13.43 26.87 53.73
68 13.24 26.47 52.94
69 13.04 26.09 52.17
70 12.86 25.71 51.43
71 12.68 25.35 50.70
72 12.50 25.00 50.00
73 12.33 24.66 49.32
74 12.16 24.32 48.65
75 12.00 24.00 48.00
76 11.84 23.68 47.37
77 11.69 23.38 46.75
78 11.54 23.08 46.15
79 11.39 22.78 45.57
80 11.25 22.50 45.00
81 11.11 22.22 44.44
82 10.98 21.95 43.90
83 10.84 21.69 43.37
84 10.71 21.43 42.86
85 10.59 21.18 42.35
86 10.47 20.93 41.86
87 10.34 20.69 41.38
88 10.23 20.45 40.91
89 10.11 20.22 40.45
90 10.00 20.00 40.00
91 9.89 19.78 39.56
92 9.78 19.57 39.13
93 9.68 19.35 38.71
94 9.57 19.15 38.30
95 9.47 18.95 37.89
96 9.38 18.75 37.50
97 9.28 18.56 37.11
98 9.18 18.37 36.73
99 9.09 18.18 36.36
100 9.00 18.00 36.00
101 8.91 17.82 35.64
102 8.82 17.65 35.29
103 8.74 17.48 34.95
104 8.65 17.31 34.62
105 8.57 17.14 34.29
106 8.49 16.98 33.96
107 8.41 16.82 33.64
108 8.33 16.67 33.33
109 8.26 16.51 33.03
110 8.18 16.36 32.73
111 8.11 16.22 32.43
112 8.04 16.07 32.14
113 7.96 15.93 31.86
114 7.89 15.79 31.58
115 7.83 15.65 31.30
116 7.76 15.52 31.03
117 7.69 15.38 30.77
118 7.63 15.25 30.51
119 7.56 15.13 30.25
120 7.50 15.00 30.00
121 7.44 14.88 29.75
122 7.38 14.75 29.51
123 7.32 14.63 29.27
124 7.26 14.52 29.03
125 7.20 14.40 28.80
126 7.14 14.29 28.57
127 7.09 14.17 28.35
128 7.03 14.06 28.13
129 6.98 13.95 27.91
130 6.92 13.85 27.69
131 6.87 13.74 27.48
132 6.82 13.64 27.27
133 6.77 13.53 27.07
134 6.72 13.43 26.87
135 6.67 13.33 26.67
136 6.62 13.24 26.47
137 6.57 13.14 26.28
138 6.52 13.04 26.09
139 6.47 12.95 25.90
140 6.43 12.86 25.71
Beware of misplaced mileposts. Milepost 165½, between Crewe and Winsford, is one of the worst, being about 3 chains from the correct location. Ignoring this error gives you a very inaccurate estimate of the train speed. Other mileposts may be only a few yards out of position. If the time between successive mileposts fluctuates wildly, this is often an indication of one or more mileposts being incorrectly sited, rather than a sudden increase or decrease in speed.
Back to Timing Page 1: