Baltimore and Ohio class S

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S class S-1 and S-1a Class
Baltimore & Ohio 2-10-2 freight locomotive, 6206 (CJ Allen, Steel Highway, 1928).jpg
B&O S-1a class #6206 in 1928
Type and origin
Power typeSteam
Build date1914,1923–1926
Total produced31 (Class S) 75 (Class S-1) 50 (Class S-1a)
RebuilderB&O
Rebuild date1925
Number rebuilt2 (6009 and 6030)
Specifications
Configuration:
 • Whyte2-10-2
Gauge4 ft 8+12 in (1,435 mm) standard gauge
Driver dia.58 in:1473 mm(S class) 64 in:1626 mm(S-1 class)
Wheelbase:
 • Engine
436.510 Ib(198.0 t : S-1 class) (184.16 : S Class)
 • Drivers347.230 Ib(157.5 t S-1 class) (152.77 t : S class)
Boiler:
 • Diameter90 in to 100 in (2286 mm to 2540 mm : S-1 class)
Boiler pressure220 Ib:15.5 kg/cm2(S-1 class) 200 Ib:14.1 kg/cm2(S Class )
Heating surface5270 sq.ft(489.6 m2 : S-1 class) (517.8 m2 : S class)
 • Tubes4881 sp.ft(140.5 m2 : S-1 class)
 • Firebox262 sq.ft(S-1 class)
Superheater:
 • Heating area1512 sq.in(140.5 m2 : S-1 class) (123.5 m2 : S class)
Cylinder size30 in x 32 in (762 mm x 813 mm : S-1 class) 30 in x 32 in (762 mm x 813 mm : S class)
Performance figures
Maximum speed55-75 Mph
Career
OperatorsBaltimore and Ohio Railroad
ClassS,S-1 and S-1a
Number in class31 (S class) 125 (S-1)
Numbers6000–6030 (S class) 6100-6224 (S-1 Class)
Nicknames"big sixes"
LocaleEastern United States
Retired1926 (2) 1938 (15) 1953-1959 (Remainder)
Preserved0
Scrapped1926,1938,1953-1959
DispositionAll Scrapped by 1959. None preserved

Baltimore and Ohio Class S comprised three 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 50 locomotives numbered 6100–6149, and 25 locomotives numbered 6150-6174. They were built between 1923 and 1924, 75 by Baldwin and by Lima Locomotive Works . The Class S-1a’s were built in 1926. The first batch of 25 were built by Lima, and numbered 6175-6199. The second batch was built by Baldwin, and numbered 6200-6224. They were nicknamed "big sixes" because until renumbering in 1954 their road numbers all began with 6. Locomotives numbered 6009 and 6030 were scrapped in 1925, and their boilers used to build new Class T 4-8-2 Mountain Type locomotives numbered 5500 & 5501. 15 of the Class were retired and scrapped in 1938. The remainder of S-1's/S-1a's continued service until 1953-1959.

None of the B&O Class S 2-10-2’s were preserved. All were scrapped.