The Mount Clare Shops is the oldest railroad manufacturing complex in the United States, located in Baltimore, Maryland.
 It was founded by the Baltimore and Ohio Railroad (B&O) in 1829.
 Mt. Clare was the site of many inventions and innovations in railroad technology.
 It is now the site of the B&O Railroad Museum.
 The museum and Mt. Clare station were designated a National Historic Landmark in 1961.
The B&O Railroad Museum is a museum exhibiting historic railroad equipment in Baltimore, Maryland, originally named the Baltimore & Ohio Transportation Museum when it opened on July 4, 1953.
 It has been called one of the most significant collections of railroad treasures in the world and has the largest collection of 19th-century locomotives in the U.S.
 The museum is located in the Baltimore and Ohio Railroad's old Mount Clare Station and adjacent roundhouse, part of the B&O's sprawling Mount Clare Shops site begun in 1829, the oldest railroad manufacturing complex in the United States.
The Baltimore and Ohio Railroad is the oldest railroad in the United States and the first common carrier railroad.
 It came into being mostly because the city of Baltimore wanted to compete with the newly constructed Erie Canal (which served New York City) and another canal being proposed by Pennsylvania, which would have connected Philadelphia and Pittsburgh.
 At first this railroad was located entirely in the state of Maryland with an original line from the port of Baltimore west to Sandy Hook.
 At this point to continue westward, it had to cross into Virginia (now West Virginia) over the Potomac River, adjacent to the confluence of the Potomac and Shenandoah rivers.
 From there it passed through Virginia from Harpers Ferry to a point just west of the junction of Patterson Creek and the North Branch Potomac River where it crossed back into Maryland to reach Cumberland.
 From there it was extended to the Ohio River at Wheeling and a few years later also to Parkersburg, West Virginia.
Duffy's Cut is the name given to a stretch of railroad tracks about 30 miles west of Philadelphia, United States, originally built for the Philadelphia and Columbia Railroad in the summer and fall of 1832.
 The line later became part of the Pennsylvania Railroad's Main Line.
 Railroad contractor Philip Duffy hired 57 Irish immigrants to lay this line through the area's densely wooded hills and ravines.
 The workers came to Philadelphia from the Ulster counties of Donegal, Tyrone and Derry to work in Pennsylvania's nascent railroad industry.
 Less than two months after their arrival, all 57 are believed to have died during the second cholera pandemic.
 While most died of the disease, forensic evidence suggests that some may have been murdered, perhaps due to fear of contagion, as the pandemic spanned several continents and many years.
Harry Porter Deuel (December 11, 1836 – November 23, 1914) was a prominent railroad man in Omaha, Nebraska.
 Over the course of his career Deuel was employed throughout the transportation sector in Omaha, working for the foremost Missouri River shipping company in Omaha during its early years.
 Later he worked for the Union Pacific and the Chicago, Burlington and Quincy railroads, among others.
 He is the namesake of Deuel County, Nebraska.
 When he resigned from his last railroad job to become the Douglas County Registrar of Deeds, Deuel was the oldest railroad man in continuous service in Omaha, and was said to be one of the best known passenger men in the Western United States.
Thomasville is a city in Davidson County, North Carolina, United States.
 The population was 26,757 at the 2010 census.
 The city is notable for its furniture industry, as are its neighbors High Point and Lexington.
 This Piedmont Triad community was established in 1852 and hosts the state's oldest festival, "Everybody's Day".
 Built around the local railway system, Thomasville is home to the oldest railroad depot in the state, just a few hundred feet from the city's most notable landmark, "The Big Chair".
William Mason is a 4-4-0 steam locomotive currently in operation at the Baltimore and Ohio Railroad Museum in Baltimore, Maryland, United States.
 It was built for the Baltimore and Ohio Railroad, carrying that railroad's number 25.
 The locomotive is named in honor of its builder, William Mason, who built around 754 steam locomotives at his Mason Machine Works firm in Taunton, Massachusetts, from 1853 until his death in 1883.
 The engine is one of the oldest operable examples of the American Standard design, and the fourth oldest Baltimore and Ohio locomotive in existence, the oldest being the 0-4-0 no. 2, the "Andrew Jackson" from 1836, second oldest is the no. 8 0-4-0, "John Hancock" built later that same year, and the third being the 0-8-0 no. 57, "Memnon" of 1848 (the preserved "Tom Thumb" and "Lafayette" engines are replicas built by the road for exhibition purposes in 1926 and 1927, respectively).
 The "William Mason" had been the second oldest operational locomotive in the world, and the oldest in the western hemisphere.
 Only the Indian locomotive "Fairy Queen", built one year prior to the "William Mason" is older.
Peter Gorman was one of the first contractors of the Baltimore and Ohio Railroad.
 His son Arthur Pue Gorman would go on to become a Senator and Pioneer in American Baseball.
 His other son William Henry Gorman would become a prominent businessman.
The Kentucky Railway Museum, now located in New Haven, Kentucky, United States, is a non-profit railroad museum dedicated to educating the public regarding the history and heritage of Kentucky's railroads and the people who built them.
 Originally created in 1954 in Louisville, Kentucky, the museum is at its third location, in extreme southern Nelson County.
 It is one of the oldest railroad stations in the United States.
The Illinois Central Stone Arch Railroad Bridges are a trio of limestone railroad bridges in the city of Dixon, Illinois, United States.
 The bridges were constructed between 1852 and 1855 as the Illinois Central Railroad laid its first rail lines across the state of Illinois.
 They were designed by Robert F. Laing for Laing and Douglas Construction Company, a railroad company contractor during the 1850s.
 Though each limestone bridge is similar in design, they each have different clearances, ranging between 12 and 15 feet (3.7 m to 4.6 m).
 The bridges remained in use by the railroad until 1985, and the three bridges were added to the U.S. National Register of Historic Places in 1987.

Question: What is the name of first contractor of the oldest railroad in the United States' son, who became a pioneer in American Baseball?
Answer: Arthur Pue Gorman