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The Pennsylvania Railroad's class FF1 was … The Pennsylvania Railroad's class FF1 was an American electric locomotive, a prototype numbered #3931 and nicknamed "Big Liz". It was built in 1917 to haul freight trains across the Allegheny Mountains where the PRR planned to electrify. "Big Liz" proved workable but too powerful for the freight cars of the time with its 4600 available horsepower and astonishing 140,000 lbf (620 kN) of tractive effort. Pulling the train it regularly snapped couplers and when moved to the rear as a pusher its force was sufficient to pop cars in the middle of the train off the tracks. It had a 2-6-6-2 wheel arrangement in two half-frames, connected in the center. Each frame had a pair of three-phase AC induction motors driving a jackshaft through gearing and a spring drive; side rods then drove the wheels. The jackshafts can be mistaken for an additional fourth axle but the "wheels" are cogwheels to transfer power from the motors to the jackshaft. Three-phase power for the 4 massive motors was supplied from the single phase overhead supply via a large rotary converter housed in the body of the locomotive. Combined rated output of the motors was 7,640 hp (5,700 kW), but the converter could only supply a short term 4,600 hp (3,400 kW) or a continuous 4,000 hp (3,000 kW). With three-phase induction motors there was no way to control the speed of the motors; changing the wiring of the motor poles allowed for two speed settings, 10.3 and 20.6 mph (16.6 and 33.2 km/h), which were considered enough to drag heavy freight trains up and down steep grades. Its intended use as an Allegheny climber never realized and its power too much for the rolling stock in service at the time, Big Liz was sidelined until being cut up for scrap in 1940.ined until being cut up for scrap in 1940.
, Die PRR FF1 war eine Elektrolokomotive der … Die PRR FF1 war eine Elektrolokomotive der US-amerikanischen Eisenbahngesellschaft Pennsylvania Railroad. Sie nahm im Vergleich zu den Elektrolokomotiven anderer Bahnen ihrer Epoche wegen ihrer Experimentalausführung, ihrer Baugröße, der hohen elektrischen Nennleistung, der enormen Zugkraft und den Eigenheiten des Fahrwerk-Antriebs eine Sonderstellung ein.Fahrwerk-Antriebs eine Sonderstellung ein.
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1917
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1917
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http://dbpedia.org/resource/Westinghouse_Electric_%281886%29 +
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4.2672
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23.1648
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1
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http://commons.wikimedia.org/wiki/Special:FilePath/PRR_FF1.jpg?width=300 +
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http://prr.railfan.net/documents/pdf/PRRElectricLocomotive_1917_RME_389-390_DennisShort.pdf +
, http://prr.railfan.net/documents/pdf/Pennsylvania_Electric_Locomotive_1918_RME_DennisShort.pdf +
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3630199
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5013
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1
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1917
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http://dbpedia.org/resource/Altoona_Works +
, with Westinghouse
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Scrapped
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11
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300
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PRR FF1
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1
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FF-1
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Electric
|
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1940
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1
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4
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Continuous:
, Starting:
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Rotary converter supplied 25 Hz three phase alternating current fed to motors able to run at one of two speeds and connected to the drivers through Jackshafts and side rods
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60.0
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PRR FF1
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| rdfs:comment |
Die PRR FF1 war eine Elektrolokomotive der … Die PRR FF1 war eine Elektrolokomotive der US-amerikanischen Eisenbahngesellschaft Pennsylvania Railroad. Sie nahm im Vergleich zu den Elektrolokomotiven anderer Bahnen ihrer Epoche wegen ihrer Experimentalausführung, ihrer Baugröße, der hohen elektrischen Nennleistung, der enormen Zugkraft und den Eigenheiten des Fahrwerk-Antriebs eine Sonderstellung ein.Fahrwerk-Antriebs eine Sonderstellung ein.
, The Pennsylvania Railroad's class FF1 was … The Pennsylvania Railroad's class FF1 was an American electric locomotive, a prototype numbered #3931 and nicknamed "Big Liz". It was built in 1917 to haul freight trains across the Allegheny Mountains where the PRR planned to electrify. "Big Liz" proved workable but too powerful for the freight cars of the time with its 4600 available horsepower and astonishing 140,000 lbf (620 kN) of tractive effort. Pulling the train it regularly snapped couplers and when moved to the rear as a pusher its force was sufficient to pop cars in the middle of the train off the tracks.in the middle of the train off the tracks.
|
| rdfs:label |
PRR-Klasse FF1
, Pennsylvania Railroad class FF1
|
