Baltimore and Ohio Class S
S class and S-1 class
B&O S-1 class #6206 in 1928 |
Type and origin |
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Power type |
Steam |
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Builder |
Baldwin (S class) Baldwin and Lima (S-1 class) |
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Build date |
1914 (S class) 1923–1926 (S-1 class) |
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Total produced |
31 (S class) 125 (S-1 class) |
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Specifications |
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Configuration |
2-10-2 |
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Gauge |
4 ft 8 1⁄2 in (1,435 mm) standard gauge |
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Driver dia. |
58 in:1473 mm(S class) 64 in:1626 mm(S-1 class) |
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Wheelbase: • Engine |
436.510 Ib(198.0 t : S-1 class) (184.16 : S Class) |
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• Drivers |
347.230 Ib(157.5 t S-1 class) (152.77 t : S class) |
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Boiler:
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• Diameter |
90 in to 100 in (2286 mm to 2540 mm : S-1 class) |
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Boiler pressure |
220 Ib:15.5 kg/cm2(S-1 class) 200 Ib:14.1 kg/cm2(S Class ) |
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Heating surface |
5270 sq.ft(489.6 m2 : S-1 class) (517.8 m2 : S class) |
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• Tubes |
4881 sp.ft(140.5 m2 : S-1 class) |
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• Firebox |
262 sq.ft(S-1 class) |
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Superheater:
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• Heating area |
1512 sq.in(140.5 m2 : S-1 class) (123.5 m2 : S class) |
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Cylinder size |
30 in x 32 in (762 mm x 813 mm : S-1 class) 30 in x 32 in (762 mm x 813 mm : S class) |
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Baltimore and Ohio Class S comprised two classes of 2-10-2 locomotives.
The S class proper were 31 locomotives built in 1914 by Baldwin Locomotive Works and numbered 6000–6030. The S-1 class comprised 125 locomotives numbered 6100–6224. They were built between 1923 and 1926, 75 by Baldwin and 50 by Lima Locomotive Works (#6150–6199).
They were nicknamed "big sixes" because of their size and because, until renumbering in 1954, their road numbers all began with "6".