B&O P-7 "President" Class 4-6-2 Pacific Steam Locomotive
The Baltimore and Ohio Railroad P-7 class was comprised of 21 4-6-2 Pacific-type locomotives. 20 units were built by the Baldwin Locomotive Works between 1927 and 1928. These were numbered from 5300 to 5319 and named after American presidents. One additional locomotive was built by the B&O shops and numbered 5320, which brought the total number in the class to 21.

The basic design was of the P7 class was taken from the USRA Heavy Pacific, however the B&O units were visually unique, and with many different sub-classes (P-7a,b,c,d, etc.) and subsequent modifications, the individual units were often visually unique to each other.

No. 5304 "President Monroe"

B&O No. 5304, the “President Monroe” was the only locomotive in the class to actually be streamlined at two different times during its working career. It was first streamlined in 1937 by the famous industrial designer Otto Kuhler and re-classed as a P-7a. In this streamlined format, it was named “The Royal Blue” and pulled a matching train. Due to its shape, it was soon nicknamed “The Bullet”. No. 5304's streamlined shrouding was removed around 1939-40 and the engine was again returned to an ordinary P7 class locomotive. In 1946, the locomotive was again streamlined for use on the B&O's new Cincinattian passenger train.

The Cincinattian

The B&O inaugurated the Cincinattian on January 19, 1947, with service between Baltimore, Maryland and Cincinnati, Ohio. The Cincinnatian is most famed for its original dedicated equipment, rebuilt in the B&O Mount Clare Shops. The design work was done by Olive Dennis, a pioneering civil engineer employed by the railroad and appointed by Daniel Willard to a special position in charge of such work for passenger service. Four P-7 "president" class Pacific locomotives (Nos. 5301-5304) were rebuilt and shrouded as class P-7d, with roller bearings on all axles and larger six-axle tenders. Older heavyweight passenger cars were completely stripped and rebuilt as streamliners. The livery used the blue and gray scheme designed by Otto Kuhler, which Dennis laid on the engine and tender in a pattern of horizontal stripes and angled lines. 

B&O Class P-7 Overview

Builder: Baldwin Locomotive Works, B&O Shops
Build date: 1927-1928
Class: P-7
Number in Class: 21
Road Numbers: 5300-5320
Wheel Arrangement: 4-6-2
Driver Diameter: 80 in
Cylinders (Diameter x Stroke): 27 x 28 in
Boiler Pressure: 230 psi 
Adhesive Weight: 91 tons
Engine Weight (w/o Tender): 148 tons
Grate Area: 70 sq. ft.
Evaporative Surface: 3,790 sq. ft.
Superheater Surface: 950 sq. ft.
Disposition: Most units retired by 1957.

B&O P-7a Class Overview

Builder: Baldwin Locomotive Works
Class: P-7a
Number in Class: 1
Road Number: 5304
Wheel Arrangement: 4-6-2 
Driver Diameter: 80 in 
Cylinders (Diameter x Stroke):  27½ x 28 in
Boiler Pressure: 230 psi
Adhesive Weight: 94 tons
Engine Weight (w/o Tender): 154 tons
Grate Area: 70 sq. ft.
Evaporative Surface: 3,875 sq. ft. 
Superheater Surface: 950 sq. ft. 
Remarks: Streamlined 1937, de-streamlined 1939-1940.

See also:

The Cincinattian Passenger Train

The B&O Railroad

Streamlined Steam Locomotives

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The B&O's Cincinattian led by No. 5301, "The President Adams", a streamlined 4-6-2 Pacific style locomotive, July 1956.
The Royal Blue on the Thomas Viaduct, south of Baltimore, in a posed 1937 publicity photo. The locomotive is P-7a class No. 5304, streamlined by Otto Kuhler.
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The B&O's Cincinattian led by No. 5301, "The President Adams", a streamlined 4-6-2 Pacific style locomotive, July 1956.

The Royal Blue on the Thomas Viaduct, south of Baltimore, in a posed 1937 publicity photo. The locomotive is P-7a class No. 5304, streamlined by Otto Kuhler.