Pennsylvania Railroad class D1 - Train

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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 (now owned by Norfolk Southern) during 1868–1872.[3] They were the first standardized class of locomotives on the railroad and shared many parts with other standard classes.[1]

PRR D1

D1 #28

Type and origin
Power type	Steam
Builder	PRR Altoona Works
Build date	1868–1872
Total produced	13

Specifications
Configuration:
• Whyte	4-4-0
• UIC	2′B
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Leading dia.	26 in (660 mm)[1]
Driver dia.	68 in (1,727 mm)[1]
Wheelbase	22 ft 5+5⁄8 in (6.85 m) (locomotive) 44 ft 11+5⁄8 in (13.706 m) (overall)[2]
Length	54 ft 6.44 in (16.6228 m)[2]
Width	9 ft 0.94 in (2.77 m)[2]
Height	14 ft 8 in (4.47 m)[2]
Adhesive weight	42,370 lb (19.2 tonnes)[2]
Loco weight	77,700 lb (35.2 tonnes)[2]
Tender weight	51,400 lb (23.3 tonnes)[2]
Total weight	129,100 lb (58.6 tonnes)[2]
Tender type	Eight-wheel with water scoop
Fuel type	Soft coal
Fuel capacity	8,000 lb (3.6 tonnes)[2]
Water cap.	2,400 US gal (9,100 l; 2,000 imp gal)[2]

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 .[4][5]

They remained in service until they were retired in 1945 and 1946 and scrapped.

References

Dredge, James (1879). The Pennsylvania Railroad. London: Engineering magazine.
Pennsylvania Railroad. "Class D1 diagram". PRR.Railfan.net. Retrieved 2008-08-19.
"PRR Steam Roster". Northeast Rails. Retrieved 2007-12-31.
Staufer, Alvin F. & Pennypacker, Bert (1962). Pennsy Power: Steam and Electric Locomotives of the Pennsylvania Railroad, 1900–1957. Staufer. LCCN 62020878.
Warner, Paul T. (1924). Motive Power Development on the Pennsylvania Railroad System. Philadelphia: Baldwin Locomotive Works.

Wikimedia Commons has media related to Pennsylvania Railroad D1.

Pennsylvania Railroad locomotives

A (0-4-0):	A1 A2 A3 A4 A5s
B (0-6-0):	B1 (s) B2 B3 B4 B5 B6 B7 B8 B1 (e)
C (0-8-0):	C1 C29 C30 C31
D (4-4-0):	D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 D16 D21 D22 D23 D24 D25 D26 D30 D31 D32 D33 D34 D35 D36 D37 D38 D39 D61 "Odd D" #10003
E (4-4-2):	E1 E2 E3 E4 E5 E6 E7 E21 E22 E23 E28 de Glehn
F (2-6-0):	F1 F2 F3 F21 F22 F23 F24 F25 F26 F27 F30 F31 F61
G (4-6-0):	G1 G2 G3 G4 G5 G53

H (2-8-0):	H1 H2 H3 H4 H5 H6 H8 H9 H10
I (2-10-0):	I1s
J (2-6-2 and 2-10-4):	J1 J28
K (4-6-2):	K1 K2 K3s K4s K5 K21s K28 K29s
L (2-8-2):	L1s L2s L5 L6
M (4-8-2):	M1
N (2-10-2):	N1s N2s
O (4-4-4):	O1

P (4-6-4):	P5
Q (4-6-4-4 and 4-4-6-4):	Q1 Q2
R (4-8-4):	R1
S (6-4-4-6 and 6-8-6):	S1 S2
T (4-4-4-4):	T1
Articulated steam locomotives:	CC1s CC2s HC1s HH1 HH1s HH2s
Articulated electric locomotives:	AA1 BB1 BB2 BB3 DD1 DD2 FF1 FF2 GG1
Non-standard:	E2b E3c E3b E44

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