PRR D7

PRR D7
PRR D7a #953 in its builders' portrait
Power type Steam
Builder PRR Altoona Works[1]
Build date 1882–1891[1]
Total produced 58 D7, 61 D7a[1]
Configuration 4-4-0
UIC classification 2′B
Gauge 4 ft 8 1⁄2 in (1,435 mm)
Leading wheel
diameter		 30 in (762 mm) (D7)[2]
33 in (838 mm) (D7a)[3]
Driver diameter 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]
Weight on drivers 56,700 lb (25.7 tonnes) (D7) [2]
58,700 lb (26.6 tonnes)[3]
Locomotive weight 93,500 lb (42.4 tonnes) (D7)[2]
96,330 lb (43.7 tonnes) (D7a)[3]
Locomotive & tender
combined weight		 160,880 lb (73.0 tonnes)[3]
Fuel type Anthracite coal[1]
Fuel capacity 12,000 lb (5.4 tonnes)[3]
Water capacity 2,400 US gal (9,100 l; 2,000 imp gal)[3]
Boiler pressure 140 lbf/in² (970 kPa)[3]
Firegrate area 34.75 sq ft (3.23 m2)[3]
Heating surface:
Tubes		 1,134 sq ft (105.35 m2)[3]
Heating surface:
Firebox		 155 sq ft (14.40 m2)[3]
Heating surface:
Total		 1,289 sq ft (119.75 m2)[3]
Cylinders 2[3]
Cylinder size 17 × 24 in (432 × 610 mm)[3]
Valve gear Stephenson
Valve type Slide valves
Tractive effort 12,138 lbf (53.99 kN) (D7)
13,313 lbf (59.22 kN) (D6a)
Factor of
adhesion		 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. ^ a b c d e "PRR Steam Roster". Northeast Rails. http://www.northeast.railfan.net/prr_steam2.html. Retrieved 2007-12-31. 
  2. ^ a b c d e Pennsylvania Railroad. "D7 Diagram". PRR.Railfan.net. http://prr.railfan.net/diagrams/PRRdiagrams.html?diag=d7_olda_anth.gif&sel=ste&sz=sm&fr=. Retrieved 2008-08-17. 
  3. ^ a b c d e f g h i j k l m n o p q r Pennsylvania Railroad. "D7a Diagram". PRR.Railfan.net. http://prr.railfan.net/diagrams/PRRdiagrams.html?diag=d7a.gif&sel=ste&sz=sm&fr=. Retrieved 2008-08-17. 
  4. ^ Staufer, Alvin F. and Pennypacker, Bert (1962). Pennsy Power: Steam and Electric Locomotives of the Pennsylvania Railroad, 1900–1957. Staufer. LCCN 62-20878. 
  5. ^ Warner, Paul T. (1924). Motive Power Development on the Pennsylvania railroad System. Philadelphia: Baldwin. 
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
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