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HH1s class

Postcard depiction of Pennsylvania Railroad #3396.

Type and origin
Power type	Steam
Builder	ALCO
Build date	1911

Specifications
Configuration:
• Whyte	2-8-8-2
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Fuel type	Coal
Firebox:
• Type	wagon-top
Cylinders	Four
Valve gear	Walschaerts
Valve type	Piston

Career
Operators	Pennsylvania Railroad
Class	HH1s
Numbers	3396
Retired	1928
Disposition	scrapped

The Pennsylvania Railroad's class HH1s comprised a single 2-8-8-2 type steam locomotive. Unlike most Pennsylvania Railroad steam locomotives, it had a wagon-top boiler. It was built by the American Locomotive Company (ALCO) in 1911. For 17 years, the single HH1s served as a helper until 1928. It had the road number 3396 and was subsequently scrapped after it was taken out of service in 1928.

References

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 G6 G53

H (2-8-0):	H1 H2 H3 H4 H5 H6 H8 H9 H10
I (2-10-0):	I1
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 E2c E3b E44