Chicago, Burlington & Quincy 4-8-2 "Mountain" Type Locomotives

Class B-1 (Locobase 2901)

Lima delivered 8 of these Mountains for the heaviest express service without doubleheading. Equipped with large 14" piston valves, Duplex automatic stokers and fitted for lignite burning.

The last of these retired in the mid-1950s.

Corbin & Kerka (1960) and Data from locomotive diagram published on Vernon Beck's website -- http://home.earthlink.net/~vnlbeck/B/B1.tif (accessed 22 March 2003).

Class B-1A (Locobase 5474)

Baldwin's 13 B-1As in 1925 were split into 7 lignite-burners, 6 bituminous. They also had the heat-treated alloy steel running gear. One later received roller bearings on the valve gear (7017) and three were refitted with roller bearings on the driving wheel axles. (14, 18, & 20).

The last of these retired in the mid-1950s.

Corbin & Kerka (1960) and Data from locomotive diagram published on Vernon Beck's website -- http://home.earthlink.net/~vnlbeck/B/B1a.tif (accessed 22 March 2003).

Specifications
Class	B-1	B-1A
Locobase ID	2901	5474
Railroad	Chicago, Burlington & Quincy (CB&Q)	Chicago, Burlington & Quincy (CB&Q)
Whyte	4-8-2	4-8-2
Road Numbers	7000-7007	7009-7020
Gauge	Std	Std
Builder	Lima	Baldwin
Year	1922	1925
Valve Gear	Walschaert	Walschaert
	Locomotive Length and Weight
Driver Wheelbase	19.25'	19.25'
Engine Wheelbase	41.63'	41.63'
Ratio of driving wheelbase to overall engine wheebase	0.46	0.46
Overall Wheelbase (engine & tender)		61.82'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers	248050 lbs	249140 lbs
Engine Weight	381400 lbs	376440 lbs
Tender Light Weight	205300 lbs	247000 lbs
Total Engine and Tender Weight	586700 lbs	623440 lbs
Tender Water Capacity	10000 gals	12000 gals
Tender Fuel Capacity (oil/coal)	20 tons	18 tons
Minimum weight per yard of rail on which locomotive could run	103.35 lb rail	103.81 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	74"	74"
Boiler Pressure	210 psi	210 psi
Cylinders (dia x stroke)	27" x 30"	27" x 30"
Tractive Effort	52754 lbs	52754 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	4.70	4.72
	Heating Ability
Firebox Area	376.80 sq. ft	377.20 sq. ft
Grate Area	78.25 sq. ft	78.25 sq. ft
Evaporative Heating Surface	4356	4253
Superheating Surface	1172	1256
Combined Heating Surface	5528	5509
Evaporative Heating Surface/Cylinder Volume	219.11	213.93
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	16432.50	16432.50
Same as above plus superheater percentage	19916.38	20178.95
Same as above but substitute firebox area for grate area	95904.05	97271.59
Power L1	21871.26	22724.59
Power MT	777.55	804.35