PRR D1

D1 #28

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

Specifications
Configuration	4-4-0
UIC class	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 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.^[3] They were the first standardized class of locomotives on the railroad and shared many parts with other standard classes.^[1]

PRR D1 fitted with experimental Westinghouse air brake equipment during the trials of September 1869.

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]

References

1 2 3 Dredge, James (1879). The Pennsylvania Railroad. London: Engineering magazine.
1 2 3 4 5 6 7 8 9 10 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

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 HH1s HH2s

Articulated electric locomotives:	AA1 BB1 BB2 BB3 DD1 DD2 FF1 FF2 GG1

Non-standard:	E2b E2c E3b E44

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