ALCO HH series

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The ALCO HH series were an early series of switcher diesel-electric locomotives built by the American Locomotive Company (ALCO) of Schenectady, New York between 1931 and 1940, when they were replaced by the S series; the 660 hp S-1 and 1,000 hp S-2. They were ALCO's first diesel switchers to enter true series production, and among the very first land vehicles anywhere to utilise the revolutionary diesel-electric power transmission.

The "HH" name stood for "High Hood", a name ALCO came eventually to use in an official context, but originally an unofficial name. Model designations such as HH600 are only semi-official. Original ALCO designations were either descriptive or based on the internal order/design number.

A total of 177 of the HH series were produced; this comprised one prototype and four production models of varying power outputs.

Contents 1 ALCO 600 (New Haven #0900) 1.1 Diesel-electric power transmission 2 HH600 2.1 Units produced 3 HH900 3.1 Units produced 4 HH660 4.1 Units produced 5 HH1000 5.1 Units produced 6 Specifications 7 Surviving units 8 Notes 9 References

[edit] ALCO 600 (New Haven #0900)

The first HH series locomotive, ALCO demonstrator #600 was mechanically almost identical to the others, but the appearance differed. The sides of the locomotive's hood sloped outward from top to bottom, and brake equipment was exposed beneath the cab. After a period of demonstration on a number of railroads, the unit was sold to the New York, New Haven and Hartford Railroad who numbered it as 0900, this number often being used to describe the locomotive, although the classification on the builder's data card was "404-OE-200". It rode on a unique pattern of trucks. This first unit was built in July 1931.

[edit] Diesel-electric power transmission

The locomotive was equipped with a 4-stroke McIntosh and Seymour Model 531 6L diesel engine, powering a General Electric GT551A1 main generator. Four nose-suspended GE-287-D traction motors in the trucks were geared at a ratio of 4.25:1 to the wheels; the motors were cooled by electrically driven traction motor blowers. ^[1]

[edit] HH600

The HH600 was nearly identical to the previous #0900 of the New Haven internally and mechanically, but it was clad in new bodywork, with a straight-sided hood and cab sides that came all the way to the frame. The HH600 was powered by a 6-cylinder McIntosh and Seymour 531 engine of 600 hp, and was built from July 1932 through May 1939; in all, 78 HH600s were constructed. The first-built units had sharp-edged front hood corners, but in 1934 ALCO employed industrial designer Otto Kuhler to clean up the appearance; he curved the corners and recessed the headlight, and all subsequent HH series units were of this style until another restyling in 1938 where the nose was further rounded. Late versions of this locomotive used the 6-cylinder 538 engine.

[edit] Units produced

Railroad	Quantity	Road numbers
American Locomotive Company (demonstrator units)	5	1, 600 (2nd), 601–603
Atchison, Topeka and Santa Fe Railway	2	2301, 2302
Belt Railway of Chicago	3	300, 302–303
Boston and Albany Railroad (NYC)	11	674–684
Boston and Maine Railroad	1	1101
Central Railroad of New Jersey	4	1020–1023
Chicago and Eastern Illinois Railroad	1	102
Chicago and Illinois Western Railroad	1	1
Delaware, Lackawanna and Western Railroad	7	402–408
Elgin, Joliet and Eastern Railroad	1	209
Hoboken Manufacturers Railroad	1	601
Illinois Central Railroad	8	9006–9013
Massena Terminal Railroad	1	7
Michigan Limestone and Chemical	2	101, 102
New York, New Haven and Hartford Railroad	10	0911–0920
Patapsco and Back Rivers Railroad	7	54–60
Peoria and Pekin Union Railroad	1	100
Portland Terminal Railroad	4	1001–1004
South Buffalo Railroad	7	50, 53–54, 56–59
Universal Atlas Cement	1	4

[edit] HH900

The HH900 was a 900 hp (670 kW) version of the HH series using a turbocharged version of the McIntosh and Seymour 531 engine. Both turbocharged models (HH900 and HH1000) needed a greater cooling capacity, and this was reflected in the larger bodyside radiator space of both models, which distinguishes them from the lower-powered HH600 and HH660. The 21 HH900 units were produced between March 1937 and January 1939, after which it was replaced by the McIntosh & Seymour 538T-engined HH1000. Several HH900s were built with the 538T engine.

[edit] Units produced

Railroad	Quantity	Road numbers
American Locomotive Company (demonstrator unit)	1	101
Birmingham Southern Railroad	8	81–88
Elgin, Joliet and Eastern Railroad	1	402
Kansas City Terminal Railroad	1	50
Minnesota Transfer Railroad	3	90–92
Philadelphia, Bethlehem and New England Railroad	1	207
Reading Railroad	2	40, 41
Warrior River Terminal Railroad	2	50, 51
Youngstown and Northern Railroad	2	211, 212

[edit] HH660

The HH660 started production in ALCO's lineup in October 1938; 43 examples were built until April 1940. It utilized a naturally aspirated version of the 6-cylinder McIntosh and Seymour 538 engine, producing 660 hp (490 kW). Externally, HH660s are indistinguishable from late HH600s.

[edit] Units produced

Railroad	Quantity	Road numbers
American Locomotive Company (plant switcher)	1	4
Atlantic Coast Line	1	1900
Boston and Maine Railroad	1	1162
Buffalo Creek Railroad	1	43
Chicago, Milwaukee, St. Paul and Pacific Railroad	4	1600–1603
Delaware, Lackawanna and Western Railroad	3	409–411
Elgin, Joliet and Eastern Railroad	3	210–212
Erie Railroad	4	302–305
Green Bay and Western	1	101
Inland Steel	1	50
Louisville and Nashville Railroad	1	10
Maine Central Railroad	2	951, 952
Minneapolis and St. Louis Railway	1	D-939
New York, New Haven and Hartford Railroad	10	0921–0930
Northern Pacific Railway	3	125–127
Southern Pacific Railroad	3	1001–1003
Tennessee Central Railroad	1	50
Wabash Railroad	2	100, 150

[edit] HH1000

The HH1000 replaced the HH900, replacing the 531 engine with the new McIntosh and Seymour 538T engine, turbocharged to produce 1000 hp (750 kW), a 100 hp (75 kW) increase on the previous model. It was produced during May 1939 and December 1940; 34 were built. M&STL D539 was the only HH1000 built with the 531T engine.

[edit] Units produced

Railroad	Quantity	Road numbers
American Locomotive Company (demonstrator unit)	1	1000
Atchison, Topeka and Santa Fe Railway	12	2310–2321
Atlantic Coast Line	1	600
Birmingham Southern Railroad	1	89
Chicago, Milwaukee, St. Paul and Pacific Railroad	1	1671
Manufacturers Railway	3	201–203
Michigan Limestone and Chemical	4	103–106
Minneapolis and St. Louis Railway	1	D-539
Missouri Pacific Railroad	1	9102
Newburg and South Shore Railroad	2	1, 2
Oliver Iron Mining Co.	7	900–906

[edit] Specifications

Overall length	45 ft 2.75 in	13.79 m
Between bolster centers:	21 ft 3 in	6.48 m
Truck wheelbase:	8 ft 0 in	2.44 m
Width over grabirons:	9 ft 10 in	3.00 m
Height above rails:	14 ft 3 in	4.34 m
Wheel diameter:	40 in	1.02 m
Fuel capacity:
Engine (HH600):	McIntosh & Seymour 531
Power (HH600):	600 hp	450 kW
Engine (HH900):	McIntosh & Seymour 531T (turbocharged)
Power (HH900):	900 hp	670 kW
Engine (HH660):	McIntosh & Seymour 538
Power (HH660):	660 hp	500 kW
Engine (HH1000):	McIntosh & Seymour 538T (turbocharged)
Power (HH1000):	1000 hp	750 kW
Main generator:
Traction motors:
Standard gearing:
Weight:

[edit] Surviving units

A few HH series switchers still survive in revenue service, and more are in museums. Working HH locomotives include a HH660 at Gopher Scrap in Mankato, Minnesota, two more owned by RELCO, and one owned by Behr Iron and Steel of Portage, Indiana. Preserved locomotives include a HH600, four HH660s, a HH900 and a HH1000.

[edit] Notes

1. ^ ALCO 600 build sheet.

[edit] References

• Pinkepank, Jerry A. (1973). The Second Diesel Spotter's Guide. Kalmbach Publishing Co., Milwaukee, WI. ISBN 0-89024-026-4.
• Sweetland, David. (2004) Santa Fe's Alco Switcher Fleet. Diesel Era Vol. 15 No. 6, November/December 2004, pp. 10-31. Withers Publishing, Halifax, Pennsylvania.
• Laundry, Mark. Alco High Hood Models. Retrieved March 29, 2005.
• Komaneski, John. ALCO HH600 Roster. Retrieved March 27, 2005. States information originally from Extra 2200 South.
• Komaneski, John. ALCO HH660 Roster. Retrieved March 27, 2005. States information originally from Extra 2200 South.
• Komaneski, John. ALCO HH900 and HH1000 Roster. Retrieved March 27, 2005. States information originally from Extra 2200 South.
  • Data sheets: HH-600, HH-660
• Steinbrenner, Richard (2003) The American Locomotive Company A Centennial Remembrance. Chapter VI subchapter "ALCO's First Production Diesels".

Diesel-electric locomotives built by ALCO
Switchers:	HH series, S-1, S-2, S-3, S-4, S-5, S-6, T-6, SSB-9
RS series:	RS-1, RS-2, RS-3, RS-11, RS-27, RS-32, RS-36
RSC series:	RSC-2, RSC-3
RSD series:	RSD-1, RSD-4, RSD-5, RSD-7, RSD-12, RSD-15
Cab units:	Black Maria, DL-103b, DL-105, DL-107, DL-109, DL-110, FA, FB, PA, PB
Century series:	C415, C420, C424, C425, C430, C628, C630, C636, C855
Diesel-hydraulics:	DH643