Somebody did have to build those steam engines on the Disneyland railroad.
The steam locomotives at Disneyland, according to steamlocomotive.com, were built by either WED Enterprises, which built Disneyland and was owned and financed by Walt Disney himself, or built by Baldwin, and had significant cosmetic changes to them:
#1, a 4-4-0, named
Cyrus K. Holliday, was built by WED Enterprises in 1955, and cost Walt Disney himself $40,000
#2, a 4-4-0, named
EP Ripley, was built by WED Enterprises in 1955, and cost Walt Disney himself $40,000
#3, a 2-4-4T, named
Fred Gurley, was built by Baldwin in 1894, was previously owned by the Godchaux Sugar Company in Louisiana, the cost of restoration was $37,000, and went into service on the Disneyland Railroad on March 28th, 1958
#4, a 2-4-0, named
Ernest S. Marsh, was built by Baldwin in 1925, was previously owned by the Pine Creek Railroad, a tourist railway in New Jersey that still exists, the cost of restoration was more then $57,000, and went into service on the Disneyland Railroad on July 25th, 1959
#5, a 2-4-4T, named
Ward Kimball, was built by Baldwin in 1902, was previously owned by the theme park Cedar Point in Sandusky, Ohio and used on their own railroad at their theme park, the Cedar Point & Lake Erie, where it was known as
Maud L.,
Maud L. was traded for a locomotive named
Ward Kimball that was too big for Disneyland, but too small for the Magic Kingdom (AKA Walt Disney World),
Maud L. was then renamed
Ward Kimball, then had a new cab and boiler built, before its restoration was suspended due to budget issues and placed into long-term storage in late 2003. Restoration resumed in 2004, which was outsourced, which included adding new driving wheels, a new smokebox door, and cosmetic features.
Ward Kimball was finally completed and entered service on the Disneyland Railroad on June 25th, 2005, just in time for Disneyland's 50th anniversary in July of that year.
The information in this post comes from steamlocomotive.com and the Disneyland Railroad's Wikipedia page.