The first 4-6-0 locomotive built in the United States was the Chesapeake, built by Norris Locomotive Works for the Philadelphia and Reading railroad in March 1847.
There are still conflicting opinions as to who the original designer of this type was.
Many authorities attribute the design to Septimus Norris of Norris Locomotive Works, but in an 1885 paper, George E. Sellers attributes the design to John Brandt who worked for the Erie Railroad between 1842 and 1851.

According to Sellers, the Erie's own management didn't feel it in their best interests to pursue construction, so Brandt approached Baldwin Locomotive Works and Norris with the design.
Baldwin was similarly uninterested, but Norris liked the idea.
James Millholland of the Reading also saw the 4-6-0 design and ordered one from Norris for the Reading.
However, Sellers may have misinterpreted some of the information since Millholland did not work for the Reading until 1848, a year after the locomotive was built.
Furthermore, Sellers refers to the first 4-6-0 to be constructed as the Susquehanna, which was the Erie railroad's first 4-6-0, not the Reading's.

The attribution to Septimus Norris stems from a patent, allegedly filed in 1846, that many sources cite for this locomotive type.
However, such a patent has not yet been found in searches at the United States Patent and Trademark Office (USPTO).
Septimus Norris did file a patent in 1854 for running gears, and the patent application showed a 4-6-0 wheel arrangement in the drawing.
Norris' wording in the 1854 patent was vague with regard to the 4-6-0 wheel arrangement and the filing did not specifically claim invention of the 4-6-0 configuration.

A few days after William Norris completed the Chesapeake, Hinkley Locomotive Works completed their first 4-6-0 locomotive, the New Hampshire, for the Boston and Maine Railroad.
The first 4-6-0 from Rogers Locomotive and Machine Works was the already-mentioned Susquehanna for the Erie Railroad.
Baldwin's first 4-6-0 locomotive did not appear until 1852.

Through the 1860s and into the 1870s, demand for locomotives of the 4-6-0 wheel arrangement grew as more railroad executives switched from purchasing a single, general-purpose type of locomotive such as the 4-4-0 American at that time, to purchasing locomotives designed for a specific purpose.
Both the Pennsylvania Railroad (PRR) and the Baltimore and Ohio Railroad (B&O) were early adopters of the 4-6-0, using them for fast freight as well as heavy passenger trains.

There were also two 3 ft narrow gauge 4-6-0 steam locomotives, No.
 72 (No.
 274) and No.
 73 (No.
 275), built by the Baldwin Locomotive Works in May 1925 for the United Railways of Yucatán in Mexico, where they were withdrawn in the 1960s.
Both locomotives were rescued and purchased by Disney imagineers Roger E. Broggie and Earl Vilmer for $8,000 each to operate on the Walt Disney World Railroad circling around the Magic Kingdom at Walt Disney World in Bay Lake, Florida.
No.
 274 became No.
 1 Walter E. Disney and No.
 275 became No.
 3 Roger E. Broggie.

A notable American ten-wheeler is the Illinois Central Railroad's No.
 382, the locomotive driven by Casey Jones in the Vaughan, Mississippi train wreck with a freight train on April 30, 1900 that killed him instantly leaving to be the only person to be dead that was immortalized in Wallace Saunders' song that make Casey Jones an American legend.
But after an eventful career, she was scrapped in July 1935 at the age of 37, the same age of her driver Casey Jones when he perished at 3:52 am on April 30, 1900.
A Clinchfield Railroad locomotive of the 4-6-0 type No.
99 replace her in 1956 and is on display at the Casey Jones museum in Jackson, Tennessee.

As far as is known, the heaviest 4-6-0 ever built was Southern Pacific No.
 2371.
According to R&LHS Bulletin No.
 94, its engine weight was 242,500 pounds (110.0 t).
 The heaviest class of 4-6-0's ever put into series production was the Pennsylvania Railroad class G5 with 90 examples completed in the mid 1920s, which were some 5,500 pounds (2.5 t) lighter.

One of the B&O's
The first 4-6-0 locomotive built in the United States was the Chesapeake, built by Norris Locomotive Works for the Philadelphia and Reading railroad in March 1847. There are still conflicting opinions as to who the original designer of this type was. Many authorities attribute the design to Septimus Norris of Norris Locomotive Works, but in an 1885 paper, George E. Sellers attributes the design to John Brandt who worked for the Erie Railroad between 1842 and 1851.
According to Sellers, the Erie's own management didn't feel it in their best interests to pursue construction, so Brandt approached Baldwin Locomotive Works and Norris with the design. Baldwin was similarly uninterested, but Norris liked the idea. James Millholland of the Reading also saw the 4-6-0 design and ordered one from Norris for the Reading. However, Sellers may have misinterpreted some of the information since Millholland did not work for the Reading until 1848, a year after the locomotive was built. Furthermore, Sellers refers to the first 4-6-0 to be constructed as the Susquehanna, which was the Erie railroad's first 4-6-0, not the Reading's.
The attribution to Septimus Norris stems from a patent, allegedly filed in 1846, that many sources cite for this locomotive type. However, such a patent has not yet been found in searches at the United States Patent and Trademark Office (USPTO). Septimus Norris did file a patent in 1854 for running gears, and the patent application showed a 4-6-0 wheel arrangement in the drawing. Norris' wording in the 1854 patent was vague with regard to the 4-6-0 wheel arrangement and the filing did not specifically claim invention of the 4-6-0 configuration.
A few days after William Norris completed the Chesapeake, Hinkley Locomotive Works completed their first 4-6-0 locomotive, the New Hampshire, for the Boston and Maine Railroad. The first 4-6-0 from Rogers Locomotive and Machine Works was the already-mentioned Susquehanna for the Erie Railroad. Baldwin's first 4-6-0 locomotive did not appear until 1852.
Through the 1860s and into the 1870s, demand for locomotives of the 4-6-0 wheel arrangement grew as more railroad executives switched from purchasing a single, general-purpose type of locomotive such as the 4-4-0 American at that time, to purchasing locomotives designed for a specific purpose. Both the Pennsylvania Railroad (PRR) and the Baltimore and Ohio Railroad (B&O) were early adopters of the 4-6-0, using them for fast freight as well as heavy passenger trains.
There were also two 3 ft narrow gauge 4-6-0 steam locomotives, No. 72 (No. 274) and No. 73 (No. 275), built by the Baldwin Locomotive Works in May 1925 for the United Railways of Yucatán in Mexico, where they were withdrawn in the 1960s. Both locomotives were rescued and purchased by Disney imagineers Roger E. Broggie and Earl Vilmer for $8,000 each to operate on the Walt Disney World Railroad circling around the Magic Kingdom at Walt Disney World in Bay Lake, Florida. No. 274 became No. 1 Walter E. Disney and No. 275 became No. 3 Roger E. Broggie.
A notable American ten-wheeler is the Illinois Central Railroad's No. 382, the locomotive driven by Casey Jones in the Vaughan, Mississippi train wreck with a freight train on April 30, 1900 that killed him instantly leaving to be the only person to be dead that was immortalized in Wallace Saunders' song that make Casey Jones an American legend. But after an eventful career, she was scrapped in July 1935 at the age of 37, the same age of her driver Casey Jones when he perished at 3:52 am on April 30, 1900. A Clinchfield Railroad locomotive of the 4-6-0 type No. 99 replace her in 1956 and is on display at the Casey Jones museum in Jackson, Tennessee.
As far as is known, the heaviest 4-6-0 ever built was Southern Pacific No. 2371. According to R&LHS Bulletin No. 94, its engine weight was 242,500 pounds (110.0 t).  The heaviest class of 4-6-0's ever put into series production was the Pennsylvania Railroad class G5 with 90 examples completed in the mid 1920s, which were some 5,500 pounds (2.5 t) lighter. 
One of the B&O's
4-6-0