Chesapeake & Ohio 4-6-4 "Hudson" Locomotives of the USA

The Chesapeake & Ohio Railroad introduced a new type of locomotive to its road in 1941. This new locomotive was the 4-6-4 and eight of them were ordered from the Baldwin Locomotive Works. They had roller bearings on all axles. One of them, number 300, had roller bearings on its side and main rods as well. 300 was also unique in that it had Union Pacific style "elephant ear" smoke deflecters applied some time around 1948. It was one of only two C&O locomotives to recieve this modification. The C&O was content to use the northern name associated with this new locomotive, Hudson, and numbered these Class L-2s 300 through 307. Although they had the same name as the NYC's Hudsons these C&O Hudsons were much larger than the NYC's J-1s.

Starting in 1946, the Chesapeake & Ohio took five of its Class F-19 Pacific 4-6-2 locomotives and converted them into Class L-1 Hudsons. This rework was done in its Huntington Shops and was completed in 1947. All but one of the new L-1s were covered with a streamlined stainless steel cowl which was painted yellow and silver. The tenders were cased in fluted stainless steel and tapered at the top so they would blend exactly with the new Budd passenger cars. The "yellowbellies" as they were called by C&O crews were numbered 490 through 494 (number 494 did not have a cowl applied). Only 490 survives today and is on display at the B&O Railroad Museum in Baltimore, MD.

In 1948, five more Hudsons were ordered from Baldwin and numbered 310 through 314. These were designated as class L-2-A. As it turned out, these were the last passenger steam locomotives built by Baldwin. They were also the heaviest hudsons ever built.

Roster by Richard Duley

ClassQtyRoad NumbersYear BuiltBuilder

Class Details by Steve Llanso of Sweat House Media

Class L-1 (Locobase 9382)

Data from C&O 12 - 1946 diagram books supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

As Pacifics, the F-19s (Locobase 137) were regarded as one of the best designs of that wheel arrangement in service. At the close of World War II, however, the Chessie decided to upgrade their passenger service with a premium express connecting Washington & Cincinnati called the Chessie.

Although characterized as a rebuild, in fact the railroad retained only the firebox from the 20-year-old engines. Karen Parker, "The C & O's Homemade Hudsons", Chesapeake and Ohio Historical Magazine (May 2006) provides a summary of the extensive rework undertaken by the Huntington shops:

*A new, one-piece cast frame with integral cylinders and main air reservoir.

*Roller bearings on all axles and in the main and side rods.

*Multiple-bearing crossheads, replacing the alligator type used on the F-19.

*New drivers that were carefully cross-counter-balanced to enable high-speed operation.

*An entirely new structure inside the boiler, reusing only the outer shell, with 41 tubes of 2.25'' outside diameter (171 fewer) and 195 flues of 3.5'' O.D. (147 more).

*A renewed but otherwise unchanged firebox.

*A Type E superheater, replacing the Type A of the F-19, and providing significantly increased super-heater heating surface (2001 sq. ft., a 65% increase) and 250' of superheat rather than 150' in the Type A.

*Slightly higher boiler pressure (210 psi vs. 200 psi).

*Cylinders of the same size (27'' x 28'') but now equipped with Franklin Type A poppet valves (oscillating cam type).

*A four-wheel trailing truck with a Franklin type E-I high speed booster, capable of operation up to 35 mph.

*A more efficient Worthington feedwater heater taken from an F-17 Pacific, which got the Elesco feedwater heater from the F-19.

*A new, very large cab."

The result was a considerably heavier engine that shone in stainless steel and a bright red-orange sloped nose and upper casing.

Parker comments that the rebuild did not have a combustion chamber and speculates that the boiler's length may have precluded its retention. Moreover, the poppet valves provided a healthy increase in horsepower. She quotes Gene Huddleston's anecdote of the engineer whose L-1 ran so smoothly and effortlessly one day that it was only the dynamic augment of a locomotive that was exceeding its counterbalanciing speed that awoke him to the realization that he was hitting 95 mph (153 kph) with six heavyweight cars.

Although the Chessie never actually ran, the L-1s put in good service throughout the C & O's passenger network. Their 74" drivers offered little real hindrance to very fast running because of the roller bearings distributed throughout. In April 1953, the first two were retired with the other three being replaced by diesels by mid-1955.

Class L-2 (Locobase 179)

Data from individual builder's cards preserved at SMU's DeGolyer Library at, last accessed 30 August 2016; and C&O 12 -1946 Locomotive Diagrams supplied in May 2005 by Alen Stanley from his extensive collection. (Thanks to Chris Hohl for his 8 August 2016 email reporting the differences in booster tractive effort between the two L-2 subclasses and providing the above-cited links..) Works numbers were 64351-64358 in December 1941-January 1942.

Firebox heating surface included 96 sq ft (8.92 sq m) in two thermic syphons, 81 sq ft (7.53sq m) in the combustion chamber, and 19 sq ft (1.77 sq m) in arch tubes. Roller bearings on all axles and, on the roller bearings on the main and side rods. An Elesco Type E feed water heater preheated the boiler water and 14" (356 mm) piston valves supplied steam to the cylinders. The Franklin Type E 12,600 lb (5,715 kg) booster was a "high-speed passenger" type that could remain engaged up to 33 mph (53 kph). The L-2 was rated to pull a fifteen-car train at 90 mph (145 kph) on tangent level track.

Five later engines--the last passenger steam locomotives ordered in the US--are show in Locobase 16231.

Class L-2a (Locobase 16231)

Data from individual builder's cards preserved at SMU's DeGolyer Library at, last accessed 30 August 2016; and C&O 12 -1946 Locomotive Diagrams supplied in May 2005 by Alen Stanley from his extensive collection. (Thanks to Chris Hohl for his 8 August 2016 email reporting the differences in booster tractive effort between the two L-2 subclasses and providing the above-cited links..) Works numbers were 73533-73537 in August 1948.

It's difficult to find an objectively based reason for a major US railroad ordering five more expensive steam locomotives in 1948. But the C&O was a coal road and believed that up-to-date steam design could compete with diesels. So it reworked the 1942 L-2 (Locobase 179) and bought the last five steam-powered express passenger locomotives produced in North America.

The boiler retained the same tube and flue counts and lengths, but the thermic syphons installed in the earlier engines were replaced by four security circulators that contributed 60 sq ft (5.57 sq m) to the heating surface area. 19 sq ft (1.77 sq m) of arch tubes were also eliminated. Another substantial change replaced standard piston valves with Franklin poppet valves.

Specifications by Steve Llanso of Sweat House Media
Locobase ID9382 179 16231
RailroadChesapeake & Ohio (C&O)Chesapeake & Ohio (C & O)Chesapeake & Ohio (C&O)
Number in Class585
Road Numbers490-494300-307310-314
Number Built85
Valve GearpoppetBakerBaker
Locomotive Length and Weight
Driver Wheelbase13'14'14'
Engine Wheelbase37.96'41.47'41.46'
Ratio of driving wheelbase to overall engine wheebase 0.34 0.34 0.34
Overall Wheelbase (engine & tender)87.77'91.69'93.87'
Axle Loading (Maximum Weight per Axle)67900 lbs72500 lbs
Weight on Drivers202500 lbs217500 lbs219500 lbs
Engine Weight388700 lbs439500 lbs443300 lbs
Tender Light Weight355300 lbs393000 lbs317500 lbs
Total Engine and Tender Weight744000 lbs832500 lbs760800 lbs
Tender Water Capacity18000 gals21000 gals21000 gals
Tender Fuel Capacity (oil/coal)28 tons30 tons30 tons
Minimum weight of rail (calculated)113 lb/yard121 lb/yard122 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter74"78"78"
Boiler Pressure210 psi255 psi255 psi
Cylinders (dia x stroke)27" x 28"25" x 30"25" x 30"
Tractive Effort49237 lbs52103 lbs52103 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.11 4.17 4.21
Heating Ability
Firebox Area281 sq. ft460 sq. ft405 sq. ft
Grate Area80.70 sq. ft90 sq. ft90.20 sq. ft
Evaporative Heating Surface4414 sq. ft4233 sq. ft4178 sq. ft
Superheating Surface2001 sq. ft1810 sq. ft1785 sq. ft
Combined Heating Surface6415 sq. ft6043 sq. ft5963 sq. ft
Evaporative Heating Surface/Cylinder Volume237.89248.35245.13
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation169472295023001
Same as above plus superheater percentage222012983529901
Same as above but substitute firebox area for grate area77303152490134258
Power L1332604438943310
Power MT1086.311349.811304.99



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