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Engine No. 156, U.S. Military R.R

Image via Wikimedia Commons, public domain
“Boston & Maine 0-4-0 locomotive by Baldwin, 1871” 

Baldwin Locomotive Works - Philadelphia, PA
http://explorepahistory.com/hmarker.php?markerId=1-A-3D6

by John Carbutt, public domain via Wikimedia Commons
President Theodore Roosevelt greeting a locomotive engineer in Vernon, Texas.

- 1905 

via Wikimedia Commons, no known restrictions
Scene of the "Stourbridge Lion” an English  locomotive displaying its power during a trial run in Honesdale (Northeastern) Pennsylvania

Notice the Stars and Stripes being waved on the right

- 1829 

via Wikimedia Commons, public domain
"American railroad men work on firebox and boiler of a big transcontinental U.S. locomotive, WWII”

via Wikimedia Commons, public domain
"Lincoln's funeral train in Philadelphia, April 22-24, 1865”

via Library of Congress, no known restrictions 
https://www.loc.gov/pictures/resource/cph.3a30104/
Great loop of the Silver Plume, Colorado

via Wikimedia Commons, public domain
Pony engine, Union Pacific Railroad 

c. 1864-1869

by Andrew J Russell via Wikimedia Commons, public domain
Union Pacific's steam locomotive 924

via Wikimedia Commons, public domain
Randolph Street Station in Chicago 

c. 1895

via Wikimedia Commons, public domain
The W.H. Whiton -  U.S. Military railroad engine in 1863

 via Wikimedia Commons, public domain
“Directors of the Union Pacific Railroad on the 100th meridian approximately 250 miles west of Omaha, Nebr. Terr. The train in background awaits the party of Eastern capitalists, newspapermen, and other prominent figures invited by the railroad executives.”

- 1866

Photo by John Carbutt via Wikimedia Commons, public domain
"Giant Bluff." Elk Canyon on Black Hills and Ft. P. R.R.

c. 1890 

by John C. H. Grabill via Wikimedia Commons, public domain
Five workers standing on a Northern Pacific Railway trestle in Washington State 

c. 1887

via Wikimedia Commons, public domain
Group of men and women sitting/standing on the front of a Sandusky locomotive 

c. 1860

via Wikimedia Commons, public domain
Engine, J.H. Devereux, Alexandria

c. 1857

via Wikimedia Commons, public domain 

https://heartfelthistory.com/age-of-the-iron-horse/
Engineer "pulls” an engine as another appears quite surprised.

via Shutterstock 

https://heartfelthistory.com/age-of-the-iron-horse/
One Of The First Ten-wheelers Of The Lehigh Valley Railroad; Main Drivers Ahead

c. 1890s

Image via Wikimedia Commons, no known restrictions 

https://heartfelthistory.com/age-of-the-iron-horse/
Marshall Pass, The Sangre de Cristo in Colorado 

c. 1870-1905

via Wikimedia Commons, public domain
President Roosevelt's western tour - the presidential train in the Rockies

- 1903

via Library of Congress, no known restrictions 

https://heartfelthistory.com/age-of-the-iron-horse/
Big train on the Virginian railroad, 1909

Weight behind engine, 7,562 tons 

via NYPL Digital Collections, no known restrictions
Two trains near Ogden, Utah - north of Salt Lake City

c. late 1800s/early 1900s

via NYPL Digital Collections, no known restrictions 

https://heartfelthistory.com/age-of-the-iron-horse/
On April 13th, 1846 The Pennsylvania Railroad received its charter.

Image: The Pennsylvania Express c. 1905 via Wikimedia Commons, public domain 

https://heartfelthistory.com/age-of-the-iron-horse/
Boston and Maine Railroad train at Middleton Station

- 1891

Image via Digital Commonwealth Massachusetts, no known restrictions
Arrival of a Central Pacific Railroad train at Oakland Wharf, San Francisco Bay

c. 1869-1886

via Wikimedia Commons, public domain 

https://heartfelthistory.com/age-of-the-iron-horse/