Baltimore and Ohio 4500

Specifications
Specifications
Configuration:;
• Whyte	2-8-2
• UIC	1′D2′ h1
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	33 in (838 mm)
Driver dia.	63 in (1,600 mm)
Trailing dia.	43 in (1,092 mm)
Wheelbase	Loco & tender: 41.98 ft (12.80 m)
Axle load	55,200 lb (25,000 kilograms; 25.0 metric tons)
Adhesive weight	220,000 lb (100,000 kilograms; 100 metric tons)
Loco weight	292,000 lb (132,000 kilograms; 132 metric tons)
Tender weight	185,400 lb (84,100 kilograms; 84.1 metric tons)
Total weight	477,400 lb (216,500 kilograms; 216.5 metric tons)
Fuel type	Coal
Fuel capacity	16 t (16 long tons; 18 short tons)
Water cap.	10,000 US gal (38,000 L; 8,300 imp gal)
Firebox:
• Grate area	66.70 sq ft (6.197 m2)
Boiler pressure	200 lbf/in2 (1.38 MPa)
Heating surface:
• Firebox	286 sq ft (26.6 m2)
Superheater:;
• Heating area	882 sq ft (81.9 m2)
Cylinders	Two
Cylinder size	26 in × 30 in (660 mm × 762 mm)
Valve gear	Walschaert

Type and origin
Type and origin
Power type	Steam
Builder	Baldwin Locomotive Works
Serial number	49153
Build date	July 4, 1918

Baltimore and Ohio 4500
Baltimore and Ohio 4500
	B&O 4500 as it was built in 1918
Power type
Type and origin
Power type	Steam
Builder	Baldwin Locomotive Works
Serial number	49153
Build date	July 4, 1918
Configuration:;
Specifications
Configuration:;
• Whyte	2-8-2
• UIC	1′D2′ h1
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	33 in (838 mm)
Driver dia.	63 in (1,600 mm)
Trailing dia.	43 in (1,092 mm)
Wheelbase	Loco & tender: 41.98 ft (12.80 m)
Axle load	55,200 lb (25,000 kilograms; 25.0 metric tons)
Adhesive weight	220,000 lb (100,000 kilograms; 100 metric tons)
Loco weight	292,000 lb (132,000 kilograms; 132 metric tons)
Tender weight	185,400 lb (84,100 kilograms; 84.1 metric tons)
Total weight	477,400 lb (216,500 kilograms; 216.5 metric tons)
Fuel type	Coal
Fuel capacity	16 t (16 long tons; 18 short tons)
Water cap.	10,000 US gal (38,000 L; 8,300 imp gal)
Firebox:
• Grate area	66.70 sq ft (6.197 m2)
Boiler pressure	200 lbf/in2 (1.38 MPa)
Heating surface:
• Firebox	286 sq ft (26.6 m2)
Superheater:;
• Heating area	882 sq ft (81.9 m2)
Cylinders	Two
Cylinder size	26 in × 30 in (660 mm × 762 mm)
Valve gear	Walschaert
Tractive effort
Performance figures
Tractive effort	54,723.81 lbf (243.42 kN)
Factor of adh.	4.08
Operators
Career
Operators	Baltimore and Ohio
Class	Q-3
Number in class	1st of 100
Numbers	B&O 4500; B&O 300 (from 1957-late 1958)
Retired	August 1957
Preserved	1958
Current owner	B&O Railroad Museum
Disposition	On static display

Baltimore and Ohio 4500 is a 2-8-2 "USRA Light Mikado" steam locomotive built by the Baldwin Locomotive Works in Philadelphia, Pennsylvania in July 1918 for the Baltimore and Ohio Railroad (B&O) as a member of the Q-3 class.

The locomotive hauled freight for the B&O until retirement in August 1957 and was donated for display at the B&O Railroad Museum in Baltimore, Maryland. It is the sole surviving Baltimore and Ohio Mikado type steam locomotive.