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Baltimore and Ohio No. 6100.

Baltimore and Ohio Class S Santa Fe Steam Locomotive
The Baltimore and Ohio's Class S consisted of two classes of 2-10-2 locomotives. They were nicknamed "Big Sixes" because of their size and, until renumbering in 1954, their road numbers all began with "6".

The S class proper were 31 locomotives built in 1914 by Baldwin Locomotive Works and numbered 6000–6030. The S-1 class was comprised of 125 locomotives numbered 6100–6224. They were built between 1923 and 1926, 75 by Baldwin and 50 by Lima Locomotive Works (Nos. 6150–6199). The Class S-1 and Class S-1a locomotives both had 64" diameter drivers, 30" x 32" cylinders, and 220 psi of boiler pressure. These locomotives could muster 84,150 pounds of tractive effort and weighed 436,510 pounds. This mighty group of 125 freight locomotives had a heating surface that featured 38 sq ft of arch tubes and a 67 sq ft combustion chamber.  Combined with their 64" diameter drivers these locomotives were both powerful and fast. Sadly, no S Class locomotives survive.

S Class Overview

Type and origin
Power type: Steam
Builder: Baldwin
Build date: 1914
Total Produced: 31
Specifications
Whyte Configuration: 2-10-2
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver diameter: 58 in (1,473 mm)
Driver Wheelbase: 21'
Locomotive Wheelbase: 40.25'
Overall Wheelbase Locomotive and Tender: 76.50'
Locomotive Weight: 410,200 lbs
Total Engine and Tender Weight: 596,310 lbs
Fuel capacity: 20 tons
Water Capacity: 9,900 gal
Boiler Pressure: 205 psi
Cylinders (dia x stroke): 30" x 32"
Tractive Effort: 86524 lbs
Factor of adhesion: 3.84
Valve Gear: Walschaert
Firebox Area: 358 sq. ft
Grate Area: 88 sq. ft
Evaporative Heating Surface: 5573 sq. ft
Superheating Surface 1329 sq. ft
Combined Heating Surface 6902 sq. ft
Career
Operator: Baltimore and Ohio Railroad
Class: S
Number in class: 31
Numbers S Class: 6000–6030
Nickname: "big sixes"
Locale: Eastern United States

Disposition: Nos. 6009 and 6030 were dismantled in 1925 and boilers used to build two new "Mountain" type locomotives. 15 of the S Class locomotives were scrapped in 1938. All others scrapped between 1953 and 1959.

S-1 Class Overview

Type and origin
Power type: Steam
Builders: Baldwin and Lima

Class: S-1

Build dates: 1923-1924
Quantity: 50
Builder: Baldwin
Road Numbers: 6100-6149

Class S-1

Build Dates: 1923-1924
Quantity: 25
Builder: Lima
Road Numbers: 6150-6174

Class S-1a
Build date: 1926

Quantity: 25
Builder: Lima
Road Numbers: 6175-6199

Class S-1a
Build dates: 1926

Quantity: 25
Builder: Baldwin
Road Numbers: 6200-6224

Specifications
Whyte Configuration: 2-10-2
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge

Driver diameter: 64 in (1,626 mm)
Locomotive Wheelbase: 42.90'
Driver Wheelbase: 22.30'
Overall Wheelbase Locomotive and Tender: 89.90'
Locomotive Weight: 436,810 lbs
Total Engine and Tender Weight: 735,210 lbs
Fuel capacity: 23 tons
Water Capacity: 15,800 gals
Boiler Pressure: 220 psi
Cylinders (diameter x stroke): 30" x 32"
Tractive Effort: 84,150 lbs
Factor of adhesion: 4.13
Valve gear: Baker
Firebox Area: 375 sq. ft
Grate Area: 88 sq. ft
Evaporative Heating Surface: 5,251 sq. ft
Superheating Surface: 1,512 sq. ft
Combined Heating Surface: 6,763 sq. ft
Career
Operator: Baltimore and Ohio Railroad
Classes: S-1, S-1a, S-1b, S-1c
Total number in class: 125
Numbers: 6100–6224
Nickname: "big sixes"
Locale: Eastern United States
Disposition: All scrapped between 1953 and 1959.

See also:

Steam Locomotives

Baldwin logo.
B&O herald.

Baltimore and Ohio No. 6100.

Lima logo.

Baltimore and Ohio S-1 Class No. 6206 in 1928.

Baltimore and Ohio S-1 Class No. 6206 in 1928.