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Technical Data for Madison Hill Locomotives, 1847 to 1954
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| M.G. Bright
(1st) |
John Brough |
Reuben Wells |
8434 Class C30 |
8542 Class C31 |
H6sb |
H10s |
SD7 diesel electric |
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| Wheel arrangement | 0-8-0T |
0-8-0T |
0-10-0T |
0-8-0T |
0-8-0T | 2-8-0 |
2-8-0 |
Co-Co |
| Starting adhesion | Cog |
Cog |
24% |
22% |
17% |
24% |
24% |
20% |
| Year service began | 1847 |
1850 |
1868 |
1896 |
1909 |
1926 |
1952 |
1953 |
| PRR tender class | None |
None |
None |
None |
None |
70 F 66 |
80 F 81 |
None |
| Engine weight, tons | 43.00 |
43.00 |
56.00 |
77.00 |
73.00 |
102.40 |
123.75 |
180.00 |
| Tender weight, tons | 0.00 |
0.00 |
0.00 |
0.00 |
0.00 |
69.40 |
88.28 |
0.00 |
| Engine & tender weight, tons | 43.00 |
43.00 |
56.00 |
77.00 |
73.00 |
171.80 |
212.03 |
180.00 |
| Boiler pressure, psi | 135 |
145 |
140 |
195 |
205 |
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| Piston diameter, inches | 20.25 |
22 |
20 |
23 |
26 |
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| Piston stroke, inches | 24 |
28 |
24 |
28 |
28 |
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| Driver diameter, inches | 42 |
50 |
46 |
56 |
62 |
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| Weight on drivers, tons | 43.00 |
43.00 |
56.00 |
77.00 |
73.00 |
90.45 |
111.50 |
180.00 |
| Marks tractive force, lbs | Cog |
Cog |
26,888 |
33,406 |
24,835 |
43,841 |
53,197 |
72,000 |
| PRR tractive force, lbs | Cog |
Cog |
Not available |
33,406 |
24,834 |
43,460 |
53,197 |
Not available |
| Marks tractive force is calculated using formulas from Marks' Mechanical Engineers’ Handbook, Fifth Edition, 1951, pp 1424-1432. PRR tractive force is from PRR's MP 109 H of November 16, 1925. |
| Marks formulas for steam locomotives | Marks formula for diesel electric locomotives |
| T = ( kPd²S)/D where: |
T = 2000AW where: |
| T = tractive force | T = tractive force |
| k = 0.85 cutoff | A = starting adhesion, % |
| P = working boiler pressure | W = weight on drivers, tons |
| d = cylinder diameter, inches | |
| S = piston stroke, inches | |
| D = driving wheel diameter, inches |
