PRR D1

Infobox Locomotive
name = PRR D1
powertype = Steam

---

caption = D1 #28
builder = PRR Altoona Works
builddate = 1868–1872
totalproduction = 13
whytetype = 4-4-0
uicclass = 2'C
gauge = RailGauge|ussg
leadingsize = convert|26|in|abbr=on
driversize = convert|68|in|abbr=on
wheelbase = convert|28|ft|5.625|in|abbr=on (locomotive)
convert|44|ft|5.825|in|abbr=on (overall)
length = convert|54|ft|6.44|in|abbr=oncite web |title = Class D1 diagram |url = http://prr.railfan.net/diagrams/PRRdiagrams.html?diag=d1.gif&sel=ste&sz=sm&fr= |author = Pennsylvania Railroad |publisher = PRR.Railfan.net |accessdate = 2008-08-19]
width = convert|9|ft|0.94|in|abbr=on
height = convert|14|ft|8|in|abbr=on
weightondrivers = convert|42370|lb|abbr=on
weight = convert|77700|lb|abbr=on
tenderweight = convert|51400|lb|abbr=on
locotenderweight = convert|129100|lb|abbr=on
tendertype = Eight-wheel with water scoop
fueltype = Soft coal
fuelc
convert|8000|lb|abbr=on
waterc
convert|2400|usgal|abbr=on The Pennsylvania Railroad's steam locomotive class D1 (formerly Class A, pre-1895) comprised thirteen 4-4-0 locomotives for express passenger service, constructed at the railroad's own Altoona Works during 1868–1872. cite web
title = PRR Steam Roster
url = http://www.northeast.railfan.net/prr_steam2.html
work = Northeast Rails
accessdate = 2007-12-31] They were the first standardized class of locomotives on the railroad and shared many parts with other standard classes.cite book
title = The Pennsylvania Railroad
first = James
last = Dredge
year = 1879
publisher = "Engineering" magazine
location = London]

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.cite book
title = Pennsy Power: Steam and Electric Locomotives of the Pennsylvania Railroad, 1900–1957
author = Staufer, Alvin F. and Pennypacker, Bert
publisher = Staufer
year = 1962
id = LOC 62-20878] cite book
title = Motive Power Development on the Pennsylvania Railroad System
first = Paul T.
last = Warner
year = 1924
publisher = Baldwin Locomotive Works
location = Philadelphia]

References