4-4-0 Guide, Meaning , Facts, Information and Description
A 4-4-0 is a type of steam locomotive. In the Whyte notation, 4-4-0 sigifies that it has a two-axle lead truck to help guide it into curves, and two driving axles coupled by a connecting rod. The 4-4-0 is most commonly known as an American type. Almost every major railroad that operated in North America in the first half of the 19th century owned and operated locomotives of this type. The famous locomotive named The General was a 4-4-0.The first use of the name American to describe locomotives of this wheel arrangement was made by Railroad Gazette in April 1872. Before that time, this wheel arrangement was known as a Standard or Eight-Wheeler. This locomotive type was so successful on American railroads that many earlier 4-2-0 and 2-4-0 locomotives were rebuilt as 4-4-0s by the middle of the 19th cenutry.
History
The first 4-4-0 design was developed by Henry R. Campbell, then the chief engineer for the Philadelphia, Germantown and Norristown Railway. Campbell received a patent for the design in February 1836, and he soon set to work building the first 4-4-0. New locomotive construction in America had begun only five years earlier at the West Point Foundry with the Best Friend of Charleston in 1831.
For the time, Campbell's 4-4-0 was a giant among locomotives. Its cylinders measured 14" diameter with a 16" stroke, it boasted 54" diameter driving wheels, could maintain 90 lbs. of steam pressure and weighed 12 tons. Campbell's locomotive was estimated to be able to pull a 450-ton train at 15 mph on level track, beating the strongest of Baldwin's 4-2-0s in tractive effort by around 63%.
However, with all of the increased power in Campbell's design, the frame and driving gear of his locomotive proved too rigid for the railroads of the time. Campbell's prototype was too prone to derailments.
At about the same time as Cambell was building his 4-4-0, the company of Eastwick and Harrison was building its own version of the 4-4-0. This locomotive, named Hercules, was completed in 1837 for the Beaver Meadow Railroad. The Hercules was built with a leading truck that was separate from the locomotive frame, making it much more suitable to the tight curves and quick grade changes of early railroads.
Even though Hercules and its successors from Eastwick and Harrison proved the viability of the new wheel arrangement, the company remained the sole builders of this type of locomotive for another two years. William Norris built that company's first 4-4-0 in 1839, followed by Rogers, Locks and Canals and Newcastle in 1840.
Henry Campbell didn't sit idly by while other manufacturers started building their own 4-4-0s. Like many executives of the modern era, Campbell sued other manufacturers and railroads for infringing on his patent. Baldwin settled with Campbell in 1845 by purchasing a license to build 4-4-0s.
As the 1840s progressed, the design of the 4-4-0 changed little, but the dimensions of a typical example of this type increased. The boiler lengthened, drivers grew in diameter and the fire grate increased in area. Early 4-4-0s were short enough that it was most practical to connect the pistons to the rear driving axle, but as the boiler lengthened, the piston rod was more frequently connected to the front driving axle.
In the following decade, locomotive manufacturers began extending the wheelbase of both the leading truck and the driving axles. By placing the axles farther from each other, manufacturers were able to mount a wider boiler completely above the wheels that extended beyond the sides of the wheels. This gave newer locomotives increased heating and steam capacity which translated to higher tractive effort. It was in this decade, the 1850s that the 4-4-0 began to look like the locomotives that are preserved today. There are less than 40 surviving 4-4-0s in the United States today.
The design and subsequent improvements of the 4-4-0 proved so successful that by 1872, 60% of Baldwin's locomotive construction was of this type, and it is estimated that fully 85% of all locomotives in operation in America were 4-4-0s. However, the 4-4-0 was soon supplanted by bigger designs , like the 2-6-0 and 2-8-0, even though the 4-4-0 was still favored for express services. The widespread adoption of the 4-6-0 and even larger locomotives helped seal its fate as a product of the past. By 1900, the 4-4-0 was obsolete in American locomotive manufacture, although they continued to serve branch lines and private industry into the mid 20th century. The last 4-4-0 built was a diminutive Baldwin product in 1945, built for the United of Yucatan Railways.