PRR D7

PRR D7a #953 in its builders' portrait

Type and origin
Power type	Steam
Builder	PRR Altoona Works^[1]
Build date	1882–1891^[1]
Total produced	58 D7, 61 D7a^[1]

Specifications
Configuration	4-4-0
UIC class	2′B
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm)
Leading dia.	30 in (762 mm) (D7)^[2] 33 in (838 mm) (D7a)^[3]
Driver dia.	68 in (1,727 mm) (D7)^[2] 62 in (1,575 mm) (D7a)^[3]
Wheelbase	22 ft 7 ¹⁄₂ in (6.90 m)^[2]^[3]
Length	58 ft 0.6 in (17.69 m)^[3]
Height	14 ft 4 in (4.37 m)^[3]
Axle load	32,650 lb (14.8 tonnes)^[3]
Adhesive weight	56,700 lb (25.7 tonnes) (D7) ^[2] 58,700 lb (26.6 tonnes)^[3]
Loco weight	93,500 lb (42.4 tonnes) (D7)^[2] 96,330 lb (43.7 tonnes) (D7a)^[3]
Total weight	160,880 lb (73.0 tonnes)^[3]
Fuel type	Anthracite coal^[1]
Fuel capacity	12,000 lb (5.4 tonnes)^[3]
Water cap	2,400 US gal (9,100 l; 2,000 imp gal)^[3]
Firebox: • Firegrate area	34.75 sq ft (3.23 m²)^[3]
Boiler pressure	140 lbf/in² (970 kPa)^[3]
Heating surface	1,289 sq ft (119.75 m²)^[3]
• Tubes	1,134 sq ft (105.35 m²)^[3]
• Firebox	155 sq ft (14.40 m²)^[3]
Cylinders	2^[3]
Cylinder size	17 in × 24 in (432 mm × 610 mm)^[3]
Valve gear	Stephenson
Valve type	Slide valves

Performance figures
Tractive effort	12,138 lbf (53.99 kN) (D7) 13,313 lbf (59.22 kN) (D6a)
Factor of adh.	4.7 (D7) 4.4 (D7a)

Class D7 (formerly Class A (anthracite), pre-1895) on the Pennsylvania Railroad was a class of 4-4-0 steam locomotive.^[4] Fifty-eight were built by the PRR's Altoona Works between 1882–1891 with 68 in (1.73 m) drivers, while sixty-one of class D7a were constructed with 62 in (1.57 m) drivers.^[1]

The D7 was fundamentally an anthracite-burning version of the PRR D6, with a larger fire-grate in order to burn the slower-burning, harder coal.^[5]

References

1 2 3 4 5 "PRR Steam Roster". Northeast Rails. Retrieved 2007-12-31.
1 2 3 4 5 Pennsylvania Railroad. "D7 Diagram". PRR.Railfan.net. Retrieved 2008-08-17.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Pennsylvania Railroad. "D7a Diagram". PRR.Railfan.net. Retrieved 2008-08-17.
↑ 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.

Wikimedia Commons has media related to Pennsylvania Railroad D7.

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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