What is an Articlulated Locmomtive?

[SpaceMouse]

Hmmm?

[cspmo]

It's a locomotive that talks well.

[SpaceMouse]

QUOTE: Originally posted by cspmo

It's a locomotive that talks well.

ROFLMAO

[n2mopac]

An articulated locomotive is a steam locomotive that has two independent sets of dirve cylendars and drivers under one boiler. One set of drivers is mounted under the boiler as on a regular steam locomotive. The othe set of drivers have the boiler resting on a slide plate on top of them. Thus the boiler can slide back and forth across these drivers. This allows the from and rear sets of drivers to take curves indepnedently, allowing a longer wheel base with more drivers to negotiate the same curves that the shorter wheel base.

i.e. the Big Boy is an articulated 4-8-8-4 locomotive. The front and rear sets of drivers each have 8 wheels. It would be impossible for a rigit 16 driver locomotive to negotiate any realistic curve, but with the independent drivers of the articulated locomotive it can. Thus more drivers, more boiler, and more horsepower are available in one locomotive.

Ron

[grayfox1119]

You nailed it Ron!

[revandy]

Great Explanation Ron, You must be a teacher at heart, and congratulations on knowing this craft so well.

[Anonymous]

QUOTE: Originally posted by SpaceMouse

QUOTE: Originally posted by cspmo

It's a locomotive that talks well.

ROFLMAO

[:D]

That is very good!

[AggroJones]

THATS an articulated!

[SpaceMouse]

QUOTE: Originally posted by AggroJones



THATS an articulated!

It speaks well of you, too.

[dwRavenstar]

QUOTE: Originally posted by cspmo

It's a locomotive that talks well.

I guess that explains why my dummy diesels have rarely called attention to themselves.

Dave (dwRavenstar)

[Anonymous]

An articulated locomotive is a steam train with 4-6 drivers( cylinders) under it.
articulateds usually have hinges under each wheelbase, but dont get confused
not all articulateds are mallets (such as the 4-8-8-4). t6he most popular articulateds
include Allengys(2-6-6-6), Big boys (4-8-8-4), challengers(4-6-6-4), triplexes(2-8-8-8-2),
yellowstones(2-8-8-4), Beyer garratt(4-8-2+2-8-4), duplexes(4-4-4-4), & the cab forward
(4-8-8-2).

[Anonymous]

QUOTE: Originally posted by AggroJones



THATS an articulated!

O winston Link has a photo of a Y6b in winter storming past near Roanoke Va at 50+ mph. Too bad I dont have my scanner otherwise I would show you what a real articulated is and does.

[vsmith]

[vsmith]

Just for clarification, an "articulated" locomotive that uses high pressure steam from the boiler in the rear cylinders then reuses the lower power exhaust in the front cylinders is a "Mallet" named after its French inventor, these were the first articulated engines, later when boiler pressures were high enough to operated both set of cylinders without recycling the steam they became known as "simple" articulated engines, Big Boy, Challenger are "simple" types.

[ben10ben]

Also keep in mind that the presence of more than one set of drivers/cylinders does not classify a locomotive as an articulated.

The Pennsylvania had a series of locomotives that all had four cylinders and at least two independent sets of drivers. The S-2, for example, was a 6-4-4-6 with the drivers split into two groups, each with their own set of cylinders. The T-1 was a 4-4-4-4 with the same type of arrangement. This engine, as well as the other duplexes, were not articulateds in any sense of the word, as all the drivers were mounted on a rigid frame.

A typical articulated could travel fairly tight curves for their size, while most duplexes were restricted to very broad curves due to their longer than normal rigid wheelbase. I believe that the S-2 has the distinction of having a longer rigid wheelbase than any other locomotive.

[Anonymous]

QUOTE: Originally posted by cspmo

It's a locomotive that talks well.

and that's why steam will always prevail over dumb Diesels.

[howmus]

QUOTE: Originally posted by SteamerFan

QUOTE: Originally posted by cspmo

It's a locomotive that talks well.

and that's why steam will always prevail over dumb Diesels.

Yeh, diesels only make 3 basic sounds - Rumble, ding, and BLLLAAAAAAAT!

Where steam has a wealth of Whhhoosh, ding, pppssssssss, Chuuffff, chick-chack, fffffffffssssssshhhhhhhh, and not to forget FFWWWWWOOOOOOOOOOT!!! LOL [:D]

Last fall my oldest son and I went to Steamtown USA for an excursion. When they switched the 2-8-2 to the rear of the train for the return trip home, they brought in the old diesel they have for backup as the trip was longer than the steamer should go without service. The Mike hooks up to the train and says FFWWWOOOT to say it is stopped and the brakes locked. Then the diesel hooks on behind it and says BLAAT!.. My son looks at me and starts to laugh! "It just isn't the same, is it Dad!" [}:)]

[n2mopac]

QUOTE: Originally posted by ben10ben

Also keep in mind that the presence of more than one set of drivers/cylinders does not classify a locomotive as an articulated.

The Pennsylvania had a series of locomotives that all had four cylinders and at least two independent sets of drivers. The S-2, for example, was a 6-4-4-6 with the drivers split into two groups, each with their own set of cylinders. The T-1 was a 4-4-4-4 with the same type of arrangement. This engine, as well as the other duplexes, were not articulateds in any sense of the word, as all the drivers were mounted on a rigid frame.

A typical articulated could travel fairly tight curves for their size, while most duplexes were restricted to very broad curves due to their longer than normal rigid wheelbase. I believe that the S-2 has the distinction of having a longer rigid wheelbase than any other locomotive.

Ben makes a good point. The term "articulated" specifically refers to a non-rigid or jointed frame, as opposed to the rigit frame of a regular steam locomotive.

Ron

[RedLeader]

QUOTE: Originally posted by vsmith

Just for clarification, an "articulated" locomotive that uses high pressure steam from the boiler in the rear cylinders then reuses the lower power exhaust in the front cylinders is a "Mallet" named after its French inventor, these were the first articulated engines, later when boiler pressures were high enough to operated both set of cylinders without recycling the steam they became known as "simple" articulated engines, Big Boy, Challenger are "simple" types.

Anatole Mallet was Swiss.

Yaou can articulate a locomotive in several ways, depending in the use you're giving it and the geography, etc.

The Mallet Configuration.

The boiler is rigidly fixed to the rear powered unit. The front engine unit pivots on the rear one, and a sliding bearing takes the weight of the forward part of the boiler.
This does not at first appear to be the best way to articulate a loco as the front end of the boiler, being fixed to the rear wheels, sticks out on curves. However it was very popular and successful in the USA ^
[image]http://www.dself.dsl.pipex.com/MUSEUM/LOCOLOCO/articult/mallet.gif[/image]

The Meyer Configuration.

Here the boiler is pivoted to BOTH engine units, rather than one, and so the boiler sticks out a lot less than in the Mallet version.
[image]http://www.dself.dsl.pipex.com/MUSEUM/LOCOLOCO/articult/meyer.gif[/image]

The Garratt Configuration.

This is similar to the Meyer, except that the boiler is slung between the two engine units instead of sitting on top of them. This allows the boiler to be mounted lower, so it can have a greater diameter and a bigger firebox, and still stay within the loading gauge.
The Beyer-Garratts were successfully used all over the world; almost the only place they were never adopted was the USA.
[image]http://www.dself.dsl.pipex.com/MUSEUM/LOCOLOCO/articult/garratt.gif[/image]
[image]http://users.powernet.co.uk/hamilton/bgpix/Kur41_th.jpg[/image]

Some other configurations where a bit more extravagant, for example the "Flexible Boiler Mallets". Eventually a larger boiler, no matter if it is articulated, will be too large and hang too far in curves, so early 20th century engineers came up with this:
[image]http://www.dself.dsl.pipex.com/MUSEUM/LOCOLOCO/flexmallet/malletb.jpg[/image]
They made the boiler flexible by using a diafragm and hinged pipes. I beleive in those days the KISS principle wasn't very known. As you can imagine those thigs kept braking and only served a few years.

The french had the "DU BOUSQUETS ". Basiclly a Garratt, but with the coal and water reservoir on the frame (as in the Mayer)
[image]http://www.dself.dsl.pipex.com/MUSEUM/LOCOLOCO/bousquet/BretelleEst1a.jpg[/image]

Another early and strange attempt to articulate a locomotive was the Fink system. The wheel sets were articulated, but the driver shafts and cylinders were fixed to the frame. The way it worked was by making a highly complicated set of axles and shafts. Never worked.

"Radiating Axle Locomotives". No, I'm not talking about radioactive axles, but axles that let the wheels turn in different angles and still transfer motion. This things were used for vary narrow locos and for very tight curves, like in mines and so.
[image]http://www.dself.dsl.pipex.com/MUSEUM/LOCOLOCO/heywood/radgearElla.gif[/image]

The Klose System was one of many designed to allow the coupled wheels of a locomotive to swivel as it followed tight bends. This means that the connecting rods have to change in effective length while still driving the wheels, but saves having to make the steam-tight swiveling joints needed for a conventional articulated locomotive. The system was called in German either Klose Lenkachsen (Klose steering axles) or Klose Triebwerk. (The Klose Engine) It was only applied to narrow-gauge locomotives.
[image]http://www.dself.dsl.pipex.com/MUSEUM/LOCOLOCO/klose/kl2a.jpg[/image]

The Hagans Oscillating-Lever System, like the Klose System, was a mechanical method of coupling together two separately swivelling parts of an articulated locomotive.
[image]http://www.dself.dsl.pipex.com/MUSEUM/LOCOLOCO/hagans/hag1.gif[/image]

The Klien-Lindner Axle
The inner central axle does not swivel, as it runs in bearings fixed to the frames outside of the wheels. Its only movements are rotation and up-and-down excursions due to the normal operation of locomotive suspension springs. It has drive cranks on the outside of the frames, coupled to the other driving wheels by conventional coupling rods.

The hollow outer axle is mounted on radial arms that permit it to swivel and move laterally, controlled by the centralising springs. The inner axle carries a large gudgeon pin that engages with the outer axle casing and drives it without interfering with these movements.
[image]http://www.dself.dsl.pipex.com/MUSEUM/LOCOLOCO/klienlindner/kl2c.jpg[/image]

[SpaceMouse]

Wow! Good work RedLeader.

[vsmith]

QUOTE: Originally posted by howmus

QUOTE: Originally posted by SteamerFan

QUOTE: Originally posted by cspmo

It's a locomotive that talks well.

and that's why steam will always prevail over dumb Diesels.

Yeh, diesels only make 3 basic sounds - Rumble, ding, and BLLLAAAAAAAT!

You forgot ALCO's, If you do you can add a cloud of smoke that would make a veteran steamer blush and the following noises...
"Schluba, Schluba, Schluba, Schluba,"
"BeeereraaaaPPPPH! Grinder, grinder, grinder..."
Phooma, phoooma, phooooooma"
"Beeeeeeelch!" and a few others that i just cant articulate in text!

[n2mopac]

QUOTE: Originally posted by SpaceMouse

Wow! Good work RedLeader.

[#ditto] [#ditto] [#ditto]

Ron

[vsmith]

And into the Bizarro world.....

http://home.att.net/~Berliner-Ultrasonics/bw-apoc2.html

scroll to bottom of page...

[Fergmiester]

QUOTE: Originally posted by dwRavenstar

QUOTE: Originally posted by cspmo

It's a locomotive that talks well.

I guess that explains why my dummy diesels have rarely called attention to themselves.

Dave (dwRavenstar)

Personally I don't care if the Loco is well spoken. To me the louder the thing "belches" is the true mark of a great loco.


Fergie[:D]