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Topic: Tractive effort

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Factor of adhesion

Steam locomotive nomenclature

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	Tractive effort - Wikipedia, the free encyclopedia
		For a locomotive to accelerate from a stationary position, it must apply a force to overcome the inertia of the train, along with the frictional forces in the form of mechanical friction, and wind resistance as the train accelerates.
		In order for this to occur a particularly high tractive effort is required, usually the maximum tractive effort of the engine is applied.
		A table to illustrate the speed the maximum tractive effort, continuous tractive effort and the speed at which the tractive effort should be reduced on a selection of trains operating in the United Kingdom:
	en.wikipedia.org /wiki/Tractive_effort (589 words)

	Tractive effort (Site not responding. Last check: 2007-11-02)
		Tractive effort is the pulling force exerted, normally by a locomotive, though the term could also be used for anything else that hauls a load.
		Tractive effort is the figure most often quoted when people are comparing the power of different steam locomotives, but the use can be misleading, because tractive effort shows the ability to start a train, not the ability to do work by hauling it.
		A related statistic is a locomotive's factor of adhesion, which is simply the weight on the locomotive's drivers divided by the starting tractive effort.
	publicliterature.org /en/wikipedia/t/tr/tractive_effort.html (362 words)

	UNILOK - Homepage
		The torque required to give tractive effort at the wheel results from the engine torque amplified through the transmission.
		Uniloks are fitted with an automatic hydrostatic speed controlled transmission as standard, giving the highest tractive effort per unit horsepower in the business.
		Tractive effort is the force exerted by a locomotive on the track for the movement of a train.
	www.unilok.ie /shunting/index.php (548 words)

	NOTTINGHAM VICTORIA - RAIL
		Tractive effort is a number calculated by a mathematical formula, taking into account factors such as boiler pressure, driving wheel diameter, cylinder size and the number of cylinders, and so forth.
		So, as can be seen, tractive effort increases with boiler pressure and the number and size of the cylinders, but decreases with increases in the diameter of the driving wheels.
		Therefore, to increase the tractive effort, ie the strength of a locomotive, engineers may increase cylinder size, number or boiler pressure, or decrease driving wheel size.
	members.tripod.com /~TimothyPlatypus/NottinghamVictoria/power.html (931 words)

	Tractive Effort (Site not responding. Last check: 2007-11-02)
		The tractive effort is obtained by multiplying the torque by the total ratio of power train and dividing this sum by the rolling radius of the driving tyres.
		Find the tractive effort where the rolling radius of driving tyres is 15 inches, the total ratio of power train is 10, the motor torque is 1000 lb in.
		Find the tractive effort where the rolling radius of driving tyres is 400 millimetres, the total ratio of power train is 10, the motor torque is 115 N m
	www.webster-inst.com /techinfo/equation/eqnfr/eqn17.htm (154 words)

	CPRR Discussion Group - Central Pacific Railroad Photographic History Museum
		In the 20th century steam locomotive power is generally expressed as tractive effort or tractive force (two terms for the same thing).
		Tractive effort, on the other hand, was determined strictly by the geometry of the locomotive.
		Tractive effort is cited as the being the "power" of the steam engine, but tractive effort is a force, not power that actually is instead (force x distance)/time.
	cprr.org /CPRR_Discussion_Group/2006/06/power-of-1860s-steam-engines.html (1243 words)

	USRA 0-6-0 and 0-8-0 Switchers - Speed and Tractive Effort - Trains.com Forums
		Tractive effort of an 0-8-0 was probably between 30 and 40 percent more than an 0-6-0 everthing else equal, but that's just a guess.
		The typical SP 0-6-0 had more tractive effort than the typical SP 2-6-0 that was capable of pulling at least 80 cars on the level.
		It would be useful to know what the dispatchers' rules of thumb were at the time (1920's/1930's), relating locomotive's rated tractive effort (ability to start a train moving) to trailing tonnage, schedule speed, rail conditions, ruling grades, 40 ft box cars, friction bearings etc. etc.
	www.trains.com /TRC/CS/forums/847980/ShowPost.aspx (2067 words)

	Continuous tractive effort - Wikipedia, the free encyclopedia
		The term tractive effort is usually used in connection with trains and rail locomotives.
		To cause movement to a stationary vehicle, a particularly high tractive effort is required, usually the maximum tractive effort of the engine is applied.
		Each engine has a speed at which the tractive effort must be reduced from the maximum tractive effort to the continuous tractive effort or lower.
	en.wikipedia.org /wiki/Continuous_tractive_effort (258 words)

	Tractive Efforts - Homepage (Site not responding. Last check: 2007-11-02)
		Tractive Efforts photography featured in an 8-page article by Jon Pratty in the November 2004 edition of the short lived Beijing Airport Journal, a magazine distributed free to passengers at Beijing's Capital Airport.
		TRACTIVE EFFORT is a measure of the force a locomotive can apply to the rail in order to move itself and it's train.
		TRACTIVE EFFORTS are my attempts to capture the magic of Chinese steam traction on film.
	www.railography.co.uk /tractive-efforts (356 words)

	Tractive Effort Tests (via CobWeb/3.1 planetlab-3.cs.princeton.edu) (Site not responding. Last check: 2007-11-02)
		Tractive effort is the force that a locomotive can apply to its coupler to pull a train.
		Most locomotive builders calculate tractive effort based on a percentage of the weight placed on the driving wheels.
		The old 25% constant doesn't hold well with diesels, tractive effort as measured by dynamometer cars have shown that the factor can often exceed 35% with the newest AC powered high power diesels.
	www.girr.org.cob-web.org:8888 /girr/tips/tips4/tractive_effort_tests.html (3163 words)

	[No title] (Site not responding. Last check: 2007-11-02)
		Tractive effort: 8.937 lb Valve gear: Stephenson Coal Capacity: tons Water Capacity: gallons Heating surface - Tubes: sq.
		Tractive effort: 9,309 lb Valve gear: Stephenson Coal Capacity: tons Water Capacity: gallons Heating surface - Tubes: sq.
		Tractive effort: 21,424 lb Valve gear: Stephenson Coal Capacity - C30: tons C30T: tons Water Capacity - C30: gallons C30T: gallons Heating surface - Tubes: sq.
	www.railpage.org.au /railpres/nswsteam (1923 words)

	[No title] (Site not responding. Last check: 2007-11-02)
		Tractive effort: 27,480 lb Valve gear: Stephenson (816-939), Walschaert (940-999) Fuel capacity - coal: 5 tons oil: 1500 gallons Water Capacity: 4,700 gallons Heating surface - Tubes: 1,564 sq.
		Tractive effort: 28,127 lb Valve gear: Walscheart Coal capacity: 5 tons (K183 modified to carry 7t in preservation) Water Capacity: 4700 gallons Heating surface - Tubes: sq.
		Tractive effort: 31,648 lb Valve gear: Walscheart Fuel capacity - coal: 5 tons (Modified to carry 9t in preservation) oil: gallons Water Capacity: 9000 gallons Heating surface - Tubes: sq.
	www.railpage.org.au /railpres/vrsteam (1183 words)

	Do it Yourself in Z-scale: Improving Locomotive Traction
		Tractive effort is the force that a locomotive is capable of exerting, though its coupler, to pull a train.
		Likewise, curves, grades, and the weight and rolling resistance of the freight all increase an the tractive effort required to move a train.
		Now, the most obvious test of tractive effort is to see how many cars a locomotive can pull on your layout.
	www.zscale.org /articles/traction.html (2593 words)

	frequently asked question
		Wheel force is the acceptable translation of Tractive Effort, which describes what happens between the tire patch and the road.
		Tractive Effort is a tangential force, a product of prime mover torque and a vehicle's transmission, and can be described as,
		Tractive Effort = (250 * 1 * 2.5) / 1) *.75 = 468.75-lbs.
	www.mustangdyne.com /FAQs/faq_02.htm (228 words)

	french shunter
		Maximum locomotive horsepower was 600hp, continuous tractive effort rating was 11,000lb at 14.6mph, the one hour rating was 30,870lb at 4.35mph.
		Maximum locomotive horsepower was 635hp, continuous tractive effort rating was 15,600lb at 9.5mph, the one hour rating was 18,170lb at 8.1mph.
		Starting tractive effort was 46,000lb, one hour wheel rim tractive effort was 27,500lb at 6.2mph, continuous was 23,000lb at 7.5mph.
	www.derbysulzers.com /frenchshunter.html (2442 words)

	Baldwin
		Initially, it seemed that the enormous horsepower of 3000 and the immense starting tractive effort of 102,000 lbs.
		tractive effort was enormous for the late forties.
		Each weighed 248,000 lb.Tractive effort was superior to other cab units of similar type.
	exotic.railfan.net /baldwinlocos.htm (737 words)

	Re: AC vs DC? - Trains.com Forums (Site not responding. Last check: 2007-11-02)
		I'm not Jay but let me try answering some of the questions, Tractive Effort is a pulling force parallel to the rails generated by the torque of the traction motors, multiplied by the motor gearing, and the leverage of the wheel radius.
		This is because the trains generally move without either of the two consists being required to produce the maximum amount of tractive effort that it is capable of producing.
		Typically the tractive effort being produced by the heavy locomotive will be no greater than the tractive effort that a standard locomotive would have produced if rail conditions had been better.
	www.trains.com /TRC/CS/forums/3/918098/ShowPost.aspx (2404 words)

	M&U No. 7, Mr. T. E. Knox Was Proven Right by Peter Brill
		Its 4-4-0 wheel arrangement and relatively low tractive effort of 20,100 lbs had been suitable for the MandU's light traffic and No.6 was reportedly the MandU's best running steam locomotive to ever appear on the roster.
		Hyman-Michaels then offered a 60 ton 4-6-2 with a tractive effort of only 18,300 lbs for $4,000 which was much smaller than other locomotives already rejected by the MandU as too small.
		Later offers included a Baldwin 2-6-0 with a tractive effort of 27,000 lbs and a weight of 64 tons for $9,250,a 70 ton 0-6-0 with a tractive effort of 31,000 lbs and a 4-6-0 with a tractive effort of 21,000 lbs for $6,000 offered by Knox while visiting the MandU offices.
	www.mnjrhs.org /knox.html (3083 words)

	Pacific Locomotive Specifications
		Tractive effort didn't change much, but the locomotive had drier, hence more potent steam.
		A few were fitted with boosters and those engines had 25" x 26" cylinders using 200-psi steam for a 40,040-lb tractive effort assisted by an 11,000-lb booster at starting.
		Although tractive effort remained about the same, the overhaul transformed the now-renumbered 6001 and she proved a powerful and reliable engine until her 1952 retirement.
	www.steamlocomotive.com /pacific/data.shtml (8431 words)

	Atlas Model Railroad Forum Archive - EXPANDED Tractive Effort Comparison 0 % & 3.95 %
		I would not worry about the methodologt too much because this is a relative scale along a spectrum of tractive force.
		Its high time we as consumers began to insist that manufacturers warrant tractive power with a representation stating an engine will pull on average X number of cars on level clean track @ so many amperes or what not.
		There is not a auto sold in America that does not represent what its engine output is and I see no reason why we can not get manufacturers to promote the relative tractive quality of their product.
	forum.atlasrr.com /archive/topic.asp?TOPIC_ID=36118 (2376 words)

	Tractive Effort in Steam Locmotives (Site not responding. Last check: 2007-11-02)
		Tractive Effort (TE) or occasionally also called Tractive Force, is often used to compare the relative power of steam locomotives.
		"The correct nominal average Tractive Effort (TE) formula is D²x S x.85 p / d, where d is the driving wheel diameter and p the boiler pressure.
		This derives from equating the work done in the cylinders over 4 piston strokes, to the work done at the drivers over one revolution.
	www.pearcedale.com /c&b/tractive.html (609 words)

	Chapter 7 (Site not responding. Last check: 2007-11-02)
		These had given good service on the Rio Grande and were more economical than the heavier engines it had since acquired.
		The engines Jeffery favored were the Denver and Rio Grande class 106, a ten-wheel passenger locomotive with a tractive effort of 18,000 pounds, and Class 113 for freight, a consolidation with 25,000 pounds tractive effort.
		Jeffery was convinced and comparable motive power was ordered: 65 consolidation freight engines with 43,300 pounds tractive effort, 35 ten-wheel passenger locomotives with a tractive effort of 29,100 pounds and 12 switchers.
	www.wplives.com /history/html/chapter_7.html (658 words)

	Dyno-Comp :: The Dyno Tuner
		Horsepower, Torque, Tractive Effort, Boost, Air/Fuel, Exhaust Gas Temperature, etc. are all monitored REAL-TIME during each run.
		Our dyno measures TRACTIVE EFFORT in addition to horsepower and torque.
		Tractive Effort is the efficiency in which power is applied to the ground.
	www.dynocomp.com /tuner.php (415 words)

	Pro-Pav Increases Tractive Effort
		The 1110W AWD offers contractors a significant increase in tractive effort while maintaining higher road speeds and other desirable characteristics of a rubber-tired paver.
		When engaged, it provides up to 90 percent more tractive effort than a conventional two-wheel-drive machine and 34 percent more than a machine equipped with optional front wheel assist.
		The Pro-Pav series 1110W AWD has the lower maintenance costs and higher travel speed of a rubber tired paver and boasts maximum tractive effort on difficult jobs.
	www.cegltd.com /story.asp?story=216 (765 words)

	McCloud River Railroad Company, McCloud River Lumber Company, McCloud Railway Company- Locomotive Rosters (Site not responding. Last check: 2007-11-02)
		Sold January 2005 to Virginia and Truckee Restoration Committee; to be moved to the Carson City, NV area in 2006.
		Built as Caddow and Choctaw RR #4; to Choctaw River Lumber Company; to United Mining and Smelting Co. #2069 (in Mexico); to McCloud River #19 1924; to Yreka Western #19 1953; to Oregon, Pacific and Eastern #19 1970; back to Yreka Western 1988.
		Originally equipped with a large tender; after several years of operation in McCloud the original tender was transfered to the Shevlin-Hixon Lumber Company in Bend, OR and replaced with a smaller Vanderbuilt-style tender.
	www.trainweb.org /mccloudrails/LocoRosterDetails.html (3881 words)

	Class 37 stock for EWS
		Tractive Effort: 156kN (35000lbf) at 13.6mph Power At Rail: 932kW (1250hp) Train Brakes: Air & Vacuum Brake Force: 50t Dimensions: 18.75 x 2.74 x 3.99m Weight: 102.8 - 108.4t Wheel Diameter: 1092mm Design Speed: 90mph Max.
		Tractive Effort: 184kN (41250lbf) at 11.4mph Design Speed: 80mph Max.
		Tractive Effort: 184kN (41250lbf) at 11.4mph Power At Rail: 935kW (1254hp) Dimensions: 18.75 x 2.74 x 3.99m Weight: 107t Design Speed: 80mph Max.
	www.angelfire.com /tn/rail/37stock.html (376 words)

	Mitsubishi Lancer Register Forum - Converting Tractive Effort to Torque (Site not responding. Last check: 2007-11-02)
		Make a note of where your peak tractive effort is on your graph eg: 5000 rpm
		Take your tractive effort figure and divide by the radius of your wheels (in feet)
		if your tractive effort is 1930 and your wheels are 245/45/17's then the radius is 0.8958 ft so the torque at the wheels is effectively 1930*.8958 = 1729 ft-lbs
	www.lancerregister.com /showthread.php?threadid=74375 (924 words)

	E&MJ
		APP’s location and geology are similar to the location and geology of NAP’s Lac des Iles mine in northwestern Ontario, which would allow NAP to utilize its operating and development experience in the design and construction of a mine at the project.
		Gold Fields invested considerable time and effort in the APP prior to a decision in April 2005 not to proceed based on increases in estimated capital and operating costs, as well as the effect of some lower-than-anticipated grades that had been found in the deposit (EandMJ, June 2005, p.
		Tractive effort is not required to create tooth penetration.
	www.mining-media.com /emj/current.html (8815 words)

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