Steam locomotive horsepower

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Steam locomotive horsepower

Various websites give tractive power,I wondered what that was approximate in Horsepower. Based at Bridgenorth on the Severn Valley Railway, it regularly appears on main line steam specials. Tractive effort--the amount of pulling force the locomotive can produce from a standing start. Horsepower--the amount of pulling force the locomotive can exert at its normal running speed.

There's no way of knowing either measure from the other measure. Steam locomotives range in tractive effort from a couple of tons for a small switcher to as much aspounds for a big mallet. Steam locomotives range in horsepower from a few hundred for a small switcher to as much as 8, for a fast passenger locomotive. As a general rule, the greater the tractive effort, the more horsepower the locomotive will be able to develop, but there is no particular formula, as locomotives differ so widely in characteristics.

A locomotive like that will generate around 2, horsepower, but the power is usually measured in tractive effort. However, the Wikipedia article on tractive force [3] supports what another has already said: Tractive force cannot be compared to Horsepower. Its simply a matter of size, per se. There is so many details here i can lay out but suffice to say, look at history as your guidline. Thus giving us all kinds of new wheel arrangements to carry the larger more powerful locos. Effeciency dogged the american railroads as the diesels started coming about.

Example: - all - hp vs hp vs hp. HP is a measurement of power. TE is a measurement of that power at work. HP is what you know powerwise what the loco is capable of. TE is what she actual does on the rails. A good heavy Texas type could pull the stars outta the sky if that kinda modern boiler was on a good set of cylinders and drivers. So look at these points for HP, boiler size, cylinder size and generally a smaller diameter driver.

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Answer Save. Hey Graham, check out this website[! To answer your question directly: This engine has an approximated Horse Power ofProducing a tractive effort stated as "35,lbs.

The Class A-4's hold the record. Steam Locomotive Horsepower. This Site Might Help You. RE: How many Horsepower does a steam train produce?

Several of the answers above are simply wrong. There are two ways to state the power of a locomotive: 1. An internet search on "steam locomotive power" will bring you lots of information.The in Whyte notation is an articulated locomotive type with two leading wheelstwo sets of six driving wheels and six trailing wheels.

Only two classes of the type were built. One was the "Allegheny" class, built by the Lima Locomotive Works. The name comes from the locomotive's first service with the Chesapeake and Ohio Railway beginning inwhere it was used to haul loaded coal trains over the Allegheny Mountains. The other was the "Blue Ridge" class for the Virginian Railway. These were some of the most powerful reciprocating steam locomotives ever built, at 7, HP which was only exceeded by the PRR Q2and one of the heaviest at tons for the locomotive itself plus tons for the loaded tender.

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All were built by the Lima Locomotive Works. No diesel engine ever surpassed the output of these giants, which were among the heaviest steam locomotives ever constructed.

As it turned out, steam locomotives continued in service for almost another 20 years.

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The state of calibration of the dynamometer car is not known. The locomotive was built to power coal trains on the 0. With one at the front and another at the back, 11,ton coal trains left Hinton, WV and were at full throttle from White Sulphur Springs a resort to the top.

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Huddleston says that 23 locomotives were equipped with steam piping for heating passenger trains. Multiple unit operation in the diesel era removed the need to pack the highest horsepower in a single unit. One H-8, thesuffered a crown sheet failure and subsequent boiler explosion at Hinton, WV in June, The force of the explosion rocketed the boiler endwise [ clarification needed ] off the running gear, killing all three crew.

While these locomotives had two sources of water for the boiler, a steam turbine pump-fed Worthington hot pump and one injector, it is not known whether any were defective at the time of dispatch. According to the family of the locomotive's engineer, Wilbur H. Anderson, of Hinton, previous crews had complained of a faulty water level gauge.

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There are only two surviving Alleghenies. Upon retirement inwas donated to The Henry Ford museum in Dearborn, Michigan where it has been on display indoors since.

On November 4th,it was partially damaged by a flood, which washed away the ground under it and nearly turned the locomotive over. Inthe shopping center donated it to the museum, where it presently resides. The has inspired the creation of the animated character "Sam", who was recently added as a locomotive to the animated children's show, Thomas And Friends.

From Wikipedia, the free encyclopedia. Archived from the original on Retrieved Drury, George H. LXVII 3. June [January ]. Steam locomotive wheel arrangements.

Shay Climax Heisler Willamette. Categories : Whyte notation Freight locomotives Lima locomotives. Hidden categories: Wikipedia articles needing clarification from August CS1: long volume value. Namespaces Article Talk. Views Read Edit View history.It is among the world's most powerful single-engined diesel locomotives.

steam locomotive horsepower

The first locomotive constructed was the "Green Machine" GEnicknamed for its green paint scheme. After testing was completed by GE, they were released to their respective owners in late The initial locomotives suffered from various mechanical problems with the most severe being the engine itself. There were major vibration problems which were addressed by increasing the engine mass to lower the resonant frequency. This in turn caused problems with the twin turbochargers.

These problems caused GE to push back full production of the new model until Changes such as stiffer materials and increased engine wall thickness to increase mass were in place at full production.

The ACCW ended production inalthough Union Pacific's 75xx series remains in daily use as ofmostly on rock and gravel trains in Texas. They hauled 99, tonnes 98, long tons ;short tons and wagons for kilometres miles between Yandi mine and Port Hedland.

The train was 7. The rebuilt units are classified as C44ACM. From Wikipedia, the free encyclopedia. This article has multiple issues.

Kory Anderson's 150 HP J.I. Case steam engine pulling 4 engines at WMSTR Rollag, Mn

Please help improve it or discuss these issues on the talk page. Learn how and when to remove these template messages. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. This article possibly contains original research.

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Rating Steam Engine Horsepower

Retrieved 22 February As railroads around the world haul larger quantities of freight efficiently, the title of world's largest locomotive has often been passed to new generations of rolling stock. The information is incomplete on some locomotives for example, the BJthus, the current leaders listed in each category may not be the actual leaders. There are many ways in which a locomotive can be the largest: the heaviest, longest, most cylinders, most power, or most wheels. It is often defined as the longest in length, but there is even a debate on whether or not to include the tender, which is equivalent to the fuel tank of a diesel, in the measurement.

American Locomotive Company Virginian. Union Pacific operated for company PR and occasional excursion service fromand officially retired in From Wikipedia, the free encyclopedia. Wikipedia list article. This list is incomplete ; you can help by expanding it. Retrieved 10 July Categories : Locomotives Transport-related lists of superlatives Railway locomotive-related lists. Hidden categories: Articles with short description Incomplete lists from October Namespaces Article Talk. Views Read Edit View history.

Languages Add links. By using this site, you agree to the Terms of Use and Privacy Policy. Indian locomotive class WAG ELF Madhepura. Four sections modification of E5K. Little Joe. Chicago, Milwaukee, St.The tractive effort required to move a train consists of numerous factors, but for most applications only four need to be considered.

First, a force of 2 to 5 pounds per ton of train weight is required to move on straight level track. At very slow yard speeds only 2 to 3 pounds is needed while increasing to about 5 pounds at higher speeds. This force is required to overcome bearing friction, rail deflection, minor flange contact, etc.

Years ago, the initial starting requirements were much higher when cars had friction bearings.

steam locomotive horsepower

Today, with all roller bearing journals, this is not much of a consideration. At speeds above 30 to 40 miles per hour, air resistance becomes significant but since this depends on the aerodynamics of specific trains, it is not addressed here.

The second factor to consider is track curvature. Cars in a curve require a good deal of tractive effort because the wheels are mounted on solid axles.

Thus the wheels must slip and slide through the curve because of the difference in radius of the inside and outside rails. Wheel flange contact adds additional friction. For the cars in the curve, the tractive effort required is 0. Degree of curvature can be calculated if the curve radius is known by dividing feet by the radius.

Curvature can also be directly measured by the following method: Stretch a cord or tape tight across two points on the rail which are 62 feet apart. Measure the distance from the midpoint of the cord to the rail. This distance in inches is equal to the degrees of curvature. The percent of grade is perhaps the most important factor governing tractive effort. One percent of a ton or pounds equals 20 pounds. The final factor and one frequently overlooked is the tractive effort required for acceleration of the train.

It takes about 10 pounds per ton to accelerate to a speed of 6 miles per hour in one minute or 12 miles per hour in two minutes, a reasonable rate for a heavy train.

Increasing this tractive effort increases the acceleration rate proportionately. The total tractive effort required for a train is the sum of these four components. The individual components will vary for any point on a rail system depending on the load in a curve or on a grade and whether acceleration is required at that point.

The kinetic energy in the train can be converted to elevation using the formula:. Where P is power in horsepower at the rails, T is tractive effort in pounds and S is speed in miles per hour. The engine horsepower at the flywheel is reduced by the auxiliaries such as air compressor, cooling fan, charging alternator, traction generator and motor losses, drive losses, and gearing losses.

Most yard switching applications seldom exceed about 30, pounds of tractive effort and speeds of 5 to 7 miles per hour. Therefore the industrial locomotive will perform well with to horsepower.I have been reading the engine stats on the big boy and the Alleganey and see that the allegany engine is rated at hp and the big boy is hp. The Alleghanie has a larger firebox and used a better grade of coal in addition. This meant more steam to do more work. In practice, the Big Boys used their high horsepower.

Used mostly on coal, the Alleghainies seldom did. Neither of them could come close to their maximum power at low speed. The unit of power is a "horsepower" and is defined as the amount of power necessary to raise 33, lbs.

The horsepower of an engine is equal to the total pressure on the piston multiplied by the number of feet it travels per minute and divided by 33, The total pressure on the piston is equal to the area in square inches multiplied by the pressure per square inch, and this pressure is not constant but varies, being nearest boiler pressure during the early part of the stroke and decreasing after the point of cut-off is reached, as the steam expands to fill the space back of the piston, until the end of the stroke.

This pressure can be measured only by means of the steam engine indicator but we can assume a value which approximates the correct one.

steam locomotive horsepower

If we have a boiler pressure of lbs. This multiplied by the area of the piston will give the total average pressure on the piston in pounds. The area of a circle is equal to its diameter multiplied by itself and the product by. The travel of the piston is equal to twice the stroke, there being two strokes for each revolution, multiplied by the number of revolutions per minute.

As the length of the stroke is usually given in inches this product must be divided by 12 to reduce the result to feet per minute. The following example is an engine with cylinder 9" bore and 10" stroke, speed rpm and boiler pressure lbs. This is the size of the J. Case engine rated 15 horsepower. This is the power delivered by the engine - brake horsepower as it is called. Courtesy of Science of Successful Threshing. Dingee-MacGregor 4th Edition J. Case Threshing Machine Co.

Nothing to do with power, which at zero RPM is zero horsepower for any engine. Which is a characteristic of every reciprocating engine.

Your internal combustion reciprocating engine in your car develops it maximum power several thousand RPM above zero, and likewise develops zero power at zero RPM.

Electrical motors generate their most power and torque at zero RPM with decreasing levels of both power and torque as the motor's RPM increases. Never too old to have a happy childhood!

Steam locomotives produce their greatest tractive effort at low speeds, but their maximum HP at higher speeds. So a steam locomotive is not "rated at zero rpm" if your interest is how much HP the boiler can produce.If you are talking about the "prime mover", which is the diesel engine that produces the electricity for the traction motors, and encompassing any diesel-electric locomotives still operating today in the US, the answer is anywhere between and Many of todays locomotives are in fact AC, or alternating current, but the majority are still direct current, or DC.

There are advantages to both, but, that is another question that needs to be asked. The actual pulling power is in the "tractive effort" of the locomotive, where wheel meets rail. An engine weighinglbs. If one needs to know how much horsepower will be required to get a specified amount of tonnage up a grade, one would employ the "Rolling Train Resistance" formula, which is as follows: take the hoursepower per ton, multiply by 12, then divide by the percentage of the grade, and that will tell you the speed which that particular train will make going up the grade.

Of course todays diesel electric locomotives can be "MUed", meaning that they can be coupled together and operated from a single control. Need more ponies, add another unit. There are still the limitations of the freight car's draft gear to contend with, limiting the amount of power than cen be entrained on the head end. The safe limit for coupler and gear islbs per square inch, but higher for "special duty" cars, like some coal cars running in unit trains. If the trailing tonnage is more than the locomotives on the head end can pull without ripping the train apart, helper engines, manned by a separate crew, or DPUs Distributed Power Unitswhich are controlled via radio by the engineer on the head end, are placed in the train to reduce the forces to a level which the draft gear near the head end can handle.

The super powerful prime movers mentioned above are a truly marvelous machine, but they are used in ships, not locomotives. Though horsepower is of little meaning, because the real work is done through tractive effort and traction motors, diesel locomotive's engines have had vast ranges in horsepower. A T turbocharged produced hp and were used in road units. The V12 and later the V16 models of the ALCO came along and cranked out hp, and upgraded versions up to hp provided the shaft wasn't busted in the V16 model Later model 's and up produced even more power.

EMD had many models, like the or for example, based around their design and had models for switchers that produced between and hp. Early 's produced up to horsepower in road units, with subsequent models up to today producing up to horsepower!

Among the more unique designs were the Fairbanks Morse opposed piston engines Addition: Despite what the answer below says, a GG1 was only horsepower The most powerfull engines in the world are the Channel Tunnel Shuttle locomotives, built from by Brush Traction in the UK with about hp each. The engines range from V6 up to V16 and range in hp from about 5 or 6, up to about 25, He told me about a prototype V12 they built with two massive turbos that put out over 45, hp.

Another fact many people don't know is that the diesel engine in a locomotive today does not turn the wheels. It turns large ft tall alternators that in turn power large electric motors that turn the wheels.

This is why some people call them diesel electric locomotives.

10 Largest Steam Locomotives Ever Built

Each alternator is big enough to walk inside and weighs more than cars. I had a chance to see some of the engines once in a family day at his work, and if you are impressed with engines, you would be in awe if you saw one in person. Back when diesels first came about, they ranged from about hp to hp. That is why you saw so many engines coupled together trying to pull trains on hills and other areas.

Yard Engines depending on make and model have hphp. For some reason some railroads use their mainline engines for yard switching. EMD to GE to


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