The Pennsylvania Railroad's N1s was a class of steam locomotive built for Lines West. They were of 2-10-2 "Santa Fe" wheel arrangement, ten driving wheels with a two-wheel leading truck and a two-wheel cast KW-pattern trailing truck under a giant firebox. This arrangement was well suited to the N1s' intended purpose, which was as a heavy drag freight engine for coal and iron ore traffic to and from lakeside ports. The design was developed by the PRR's Fort Wayne Shops and orders were placed with Alco (Brooks) (35 locomotives) and Baldwin (25 locomotives) for a total of 60; the first Alco locomotive was delivered in December 1918, with the remainder arriving during 1919.
Pennsylvania Railroad N1s
PRR N1s #7246 at Youngstown, Ohio in 1919, when less than a year old. Note the Lines West central headlight (later relocated higher) and high slope-sided tender coal space
The N1s was a large locomotive; the boiler was the largest then used on any non-experimental PRR locomotive, with a large Belpaire firebox with 79.9 square feet (7.4 m2) of grate area and a 5-foot (1.52 m) long combustion chamber. No feedwater heater was fitted, but a mechanical stoker and power reverse were, necessities on such a large locomotive. Boiler pressure was 215 pounds per square inch (1.48 MPa), although it was designed to take a pressure of 250 psi (1.72 MPa).
To allow the locomotive to negotiate tight 23-degree curves, the first and fifth driving axles were fitted with lateral motion devices and the center axle was blind.
In many respects, the N1s was similar in ability to the I1s2-10-0 "Decapod". Driver diameter, weight on drivers and cylinder size were almost identical. The N1s' boiler was larger, but of a lower pressure. The I1s' tractive effort was a little higher, while the N1s had a superior factor of adhesion. The N1s, as a low-speed drag hauler, was limited to 35 mph (56 km/h), while the I1s was capable of 50 mph (80 km/h) or greater.
The N1s were the first class of large power withdrawn after diesel locomotives appeared; all were gone by 1950, and none were saved for display. Their task, low-speed drag haulage, was the diesel locomotive's forte.
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January 26, 2023
pennsylvania, railroad, class, this, article, does, cite, sources, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, july, 2009, learn, . This article does not cite any sources Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Pennsylvania Railroad class N1s news newspapers books scholar JSTOR July 2009 Learn how and when to remove this template message The Pennsylvania Railroad s N1s was a class of steam locomotive built for Lines West They were of 2 10 2 Santa Fe wheel arrangement ten driving wheels with a two wheel leading truck and a two wheel cast KW pattern trailing truck under a giant firebox This arrangement was well suited to the N1s intended purpose which was as a heavy drag freight engine for coal and iron ore traffic to and from lakeside ports The design was developed by the PRR s Fort Wayne Shops and orders were placed with Alco Brooks 35 locomotives and Baldwin 25 locomotives for a total of 60 the first Alco locomotive was delivered in December 1918 with the remainder arriving during 1919 Pennsylvania Railroad N1sPRR N1s 7246 at Youngstown Ohio in 1919 when less than a year old Note the Lines West central headlight later relocated higher and high slope sided tender coal spaceType and originPower typeSteamBuilderALCO Brooks 35 Baldwin Locomotive Works 25 Build date1918 1919Total produced60SpecificationsConfiguration Whyte2 10 2 UIC1 E1 hGauge4 ft 8 1 2 in 1 435 mm Leading dia 33 in 0 838 m Driver dia 62 in 1 575 m Trailing dia 36 in 0 914 m WheelbaseLocomotive 41 ft 11 1 2 in 12 79 m Length91 ft 4 5 8 in 27 85 m Axle load75 600 lb 34 300 kg 34 3 t Adhesive weight351 000 lb 159 000 kg 159 t Loco weight435 000 lb 197 000 kg 197 t Tender weightEmpty 86 800 lb 39 400 kg 39 4 t Loaded 206 100 lb 93 500 kg 93 5 t Tender type100 F 85Fuel typeCoalFuel capacity39 300 lb 17 800 kg 17 8 t Water cap 9 600 US gal 36 000 l 8 000 imp gal Firebox Firegrate area79 9 sq ft 7 4 m2 Boiler pressure215 psi 1 48 MPa CylindersTwoCylinder size30 in 32 in 762 mm 813 mm Valve gearWalschaertsPerformance figuresMaximum speed35 mph 56 km h Tractive effort84 890 lbf 377 61 kN Factor of adh 4 13CareerRetiredby 1950DispositionAll scrapped PRR N1s 8363 in its official builders photo The N1s was a large locomotive the boiler was the largest then used on any non experimental PRR locomotive with a large Belpaire firebox with 79 9 square feet 7 4 m2 of grate area and a 5 foot 1 52 m long combustion chamber No feedwater heater was fitted but a mechanical stoker and power reverse were necessities on such a large locomotive Boiler pressure was 215 pounds per square inch 1 48 MPa although it was designed to take a pressure of 250 psi 1 72 MPa To allow the locomotive to negotiate tight 23 degree curves the first and fifth driving axles were fitted with lateral motion devices and the center axle was blind In many respects the N1s was similar in ability to the I1s 2 10 0 Decapod Driver diameter weight on drivers and cylinder size were almost identical The N1s boiler was larger but of a lower pressure The I1s tractive effort was a little higher while the N1s had a superior factor of adhesion The N1s as a low speed drag hauler was limited to 35 mph 56 km h while the I1s was capable of 50 mph 80 km h or greater The N1s were the first class of large power withdrawn after diesel locomotives appeared all were gone by 1950 and none were saved for display Their task low speed drag haulage was the diesel locomotive s forte References Edit Retrieved from https en wikipedia org w index php title Pennsylvania Railroad class N1s amp oldid 1015712694, wikipedia, wiki, book, books, library,
