Pennsylvania Railroad Class D1

The Pennsylvania Railroad's steam locomotive class D1 (formerly Class A, pre-1895) were a series of 4-4-0 locomotives for express passenger service, constructed at the railroad's own Altoona Works (now owned by Norfolk Southern) during 1868–1872 for the Pennsylvania Railroad.
The PRR was the first American railroad to adopt the Westinghouse air brake, the first tests of which were made in September 1869; Class A locomotives were among those fitted with air brake equipment for those earliest tests.
They remained in service until 1945, and were all withdrawn and scrapped by 1946.
==Stock list==
Image	No.	Build date	Manufacturer 	Notes 	
 	13 	1868 	Altoona Works	Withdrawn and scrapped.	
 	14 	1868 	Altoona Works	Withdrawn and scrapped.	
 	28 	1872 	Altoona Works	Withdrawn and scrapped.	
 	331	1865 	Altoona Works	Withdrawn and scrapped.	
 	332	1865 	Altoona Works	Withdrawn and scrapped.	
== Trivia ==
* There are thirteen of these that were built.
* They were the first standardized class of locomotives on the railroad and shared many parts with other standard classes.
Category:Steam locomotives
Category:Tender locomotives
Category:American locomotives
Category:4-4-0 steam locomotives
Category:Four-coupled locomotives
Category:Pennsylvania locomotives
Category:Scrapped locomotives
Category:Built in 1868
Category:Locomotives
Category:Standard gauge locomotives
Category:Rebuilds
Category:4-4-0 locomotives
Category:Lima locomotives
Category:Altoona Works locomotives
Category:Scrapped steam locomotives
Category:United States
Category:Scrapped steam locomotives