About: Southern Pacific class MM-2

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Southern Pacific Company's MM-2 class of steam locomotives was Southern Pacific's (SP) only class of 2-6-6-2 locomotives ordered and built as oil-fired cab forward locomotives. They were built in 1911 as compound-expansion Mallet locomotives by Baldwin Locomotive Works and entered service on SP beginning September 19, 1911. By 1914, they had all been upgraded with an additional leading axle making them 4-6-6-2 locomotives, reclassified from MM-2 to AM-2. This was done to improve handling at speed. These locomotives were the predecessors of several other cab-forward engines, culminating in the AC-12 class cab forward locomotives built during World War II.

Attributes	Values
rdf:type	Thing schema:Product mean of transportation Locomotive yago:WikicatBaldwinLocomotives animal yago:WikicatMalletLocomotives yago:WikicatScrappedLocomotives yago:WikicatSouthernPacificRailroadLocomotives yago:WikicatSteamLocomotivesOfTheUnitedStates yago:Artifact100021939 yago:Container103094503 yago:Conveyance103100490 yago:Instrumentality103575240 yago:Locomotive103684823 yago:Object100002684 yago:PhysicalEntity100001930 locomotive yago:Self-propelledVehicle104170037 yago:SteamLocomotive104310018 yago:Vehicle104524313 yago:WheeledVehicle104576211 yago:Whole100003553 yago:Wikicat2-6-6-2Locomotives yago:Wikicat4-6-6-2Locomotives yago:WikicatRailwayLocomotivesIntroducedIn1911
rdfs:label	Southern Pacific class MM-2 (en)
rdfs:comment	Southern Pacific Company's MM-2 class of steam locomotives was Southern Pacific's (SP) only class of 2-6-6-2 locomotives ordered and built as oil-fired cab forward locomotives. They were built in 1911 as compound-expansion Mallet locomotives by Baldwin Locomotive Works and entered service on SP beginning September 19, 1911. By 1914, they had all been upgraded with an additional leading axle making them 4-6-6-2 locomotives, reclassified from MM-2 to AM-2. This was done to improve handling at speed. These locomotives were the predecessors of several other cab-forward engines, culminating in the AC-12 class cab forward locomotives built during World War II. (en)
foaf:name	Southern Pacific class MM-2 (en)
name	Southern Pacific class MM-2 (en)
foaf:depiction
dcterms:subject	Baldwin locomotives 4-6-6-2 locomotives Standard gauge locomotives of the United States 2-6-6-2 locomotives Mallet locomotives Railway locomotives introduced in 1911 Scrapped locomotives Steam locomotives of the United States Southern Pacific Railroad locomotives
Wikipage page ID	3821359 (xsd:integer)
Wikipage revision ID	1021124056 (xsd:integer)
Link from a Wikipage to another Wikipage	Scrap Bore (engine) Baldwin locomotives Sacramento, California Mallet (locomotive) Sierra Nevada Steam locomotive Feedwater heater Fuel oil Stroke (engine) Baldwin Locomotive Works Walschaerts valve gear 4-6-6-2 4-6-6-2 locomotives Standard gauge locomotives of the United States 2-6-6-2 2-6-6-2 locomotives Mallet locomotives Railway locomotives introduced in 1911 Scrapped locomotives Steam locomotives of the United States Southern Pacific Railroad locomotives Cab forward Southern Pacific class AC-12 Southern Pacific class AM-2 Oregon Mallet locomotive Tractive effort Southern Pacific Company Leading wheels
sameAs	Southern Pacific class MM-2 Southern Pacific class MM-2 Southern Pacific class MM-2 Southern Pacific class MM-2
superheatertype	None (en)
dbp:wikiPageUsesTemplate	dbt:SP_cab_forward_locomotives dbt:Cite_book dbt:Convert dbt:Infobox_locomotive dbt:One_source dbt:Track_gauge
thumbnail	wiki-commons:Special:FilePath/Southern_Pacific_forward_cab_locomotive.jpg?width=300
builddate	July–August 1911 (en)
firstrundate	1911-09-19 (xsd:date)
powertype	Steam (en)
retiredate	1946 (xsd:integer)
serialnumber	366843668536687 (xsd:decimal)
uicclass	C1′ n4v (en)
valvegear	Walschaerts valve gear
whytetype	2 (xsd:integer)
builder	Baldwin Locomotive Works
fleetnumbers	4200 (xsd:integer)
operator	Southern Pacific Company
has abstract	Southern Pacific Company's MM-2 class of steam locomotives was Southern Pacific's (SP) only class of 2-6-6-2 locomotives ordered and built as oil-fired cab forward locomotives. They were built in 1911 as compound-expansion Mallet locomotives by Baldwin Locomotive Works and entered service on SP beginning September 19, 1911. By 1914, they had all been upgraded with an additional leading axle making them 4-6-6-2 locomotives, reclassified from MM-2 to AM-2. This was done to improve handling at speed. These locomotives were the predecessors of several other cab-forward engines, culminating in the AC-12 class cab forward locomotives built during World War II. SP used these locomotives in the Sierra Nevada for about 20 years, retiring them in the mid-1930s. They were stored in the railroad's Sacramento, California, shops for a couple years before being rebuilt with 4B Worthington feedwater heaters and uniform cylinders (making them simple-expansion them) measuring 22 in × 28 in (559 mm × 711 mm), diameter × stroke. The rebuilds increased the class weight to 424,200 lb (192,400 kg) with 356,900 lb (161,900 kg) on the drivers, 210 psi (1.4 MPa) boiler pressure and 76,800 lbf (342 kN) tractive effort. The rebuilt locomotives were renumbered into the 3900 series then used on SP's Portland Division in Oregon until they were again retired in the late 1940s. The locomotives were all scrapped soon after retirement with the last, 3907 (originally 4207), on September 23, 1948. (en)
cylindercount	Four: two high pressure , two low pressure (en)
disposition	All scrapped (en)
feedwaterheater	4 (xsd:integer)
fueltype	Fuel oil

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