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Thread: An INTRO to Locomotives..Steam /Diesel Electric / Electric.

  1. #11
    Rusted Brat's Avatar
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    Sir, always had a fascination towards the steam locomotives,
    I suppose radio controlled jet propulsion would soon make it to xbhp as well?
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  2. #12
    psr
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    Quote Originally Posted by Brat View Post
    Sir, always had a fascination towards the steam locomotives,
    I suppose radio controlled jet propulsion would soon make it to xbhp as well?
    Ha ha I can guess what you are referring to....it is too complex ..and I do not know if i have the capacity to simplify it...
    I will be moving on to the Diesel Electric locos and much later Electric locos ...
    Last edited by psr; 05-30-2012 at 06:28 PM.
    When Was The Last Time,You Did Something For The First Time.

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    Rusted Saerius's Avatar
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    Ok ok so i have some questions and it may sound nubile.

    The exhaust steam is used to superheat the steam? i always thought that the superheater in steam locos takes the wet steam from the water chamber and runs it in front of the exhaust from the fire tubes only, and that this superheater is a seperate unit instead of being integrated along side with the fire tubes. So most of the boilers are designed like so with the superheating being done by the exhaust steam injected/ flowed thru the water chamber?

    Thought the soviet 2-3-2b was the monster of the locomotive world, big boy takes the cake.

    the 4-8-8-4 means that the engine has 4 articulated parts? the front guide wheels then the front driving wheels , then the rear driving wheels and then rear guiding wheels? or does the 4-8-8-4 notation just indicate the wheel arrangement and does not indicate the articulation as well?

    Never knew about Fireless Locomotives

    erm hehe I guess enough nubility for now.
    When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car

  4. #14
    psr
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    Your queries are not of a nube ,and I welcome it.....
    Here is the 4-8-8-4 configuration arrangement..The Big Boy had Mallet type articulation..which means the front ,leading set of 4-8 are on a pinion swing articulation while the trailing 8-4 are fixed.
    Of course the front 4 are for weight support and guide , while the next 8 wheels are the powered ones., followed by 8 driven(powered) wheels and four non powered ones.





    the most common form of superheater is the fire-tube type. This takes the saturated steam supplied in the dry pipe into a superheater header mounted against the tube sheet in the smoke box.The steam is then passed through a number of superheater elements—long pipes which are placed inside special, widened fire tubes, called flues. Hot combustion gases from the locomotive's fire pass through these flues just like they do the firetubes, and as well as heating the water they also heat the steam inside the superheater elements they flow over. The superheater element doubles back on itself so that the heated steam can return; most do this twice at the fire end and once at the smokebox end, so that the steam travels a distance of four times the header's length while being heated. The superheated steam, at the end of its journey through the elements, passes into a separate compartment of the superheater header and then to the cylinders as normal.Here is an Image to clarify.......


    The fireless Locomotive is always a long boiler like in shape in which either very hot water/steam or compressed air is stored under high pressure and used for Locomotion.
    Hope your doubts are cleared..
    Last edited by psr; 08-13-2012 at 11:20 AM.
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    Rusted Saerius's Avatar
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    Ok so there is only one articulated joint in the engine chassis. This articulation works only on the horizontal axis? or is there some articulation provided along the vertical axis as well, or is the job totally left to the suspension? if it is left to the suspension alone, wont it stress the pinion swing joint?

    Also asking just to be sure, the pistons of the front and rear are not pressure linked, or mechanically linked, are they? do they work in synchronisation eg: like two v8s mechanically coupled or are they mechanically dis sync v8s having independent gearboxes and transfer-cases? In case the driver gave too much throttle and the wheels of the front driving unit starts to spin and lose traction the rear unit will still maintain traction due to the load transfer?

    if the answer to the vertical articulation is yes then the rear wheels will be the ones spinning (just statics assumption )

    Psr sir the pic of the superheater isnt showing.

    Boiler type mountings will be used on the steam accumulators of the fireless locomotives and boiler accessories will be used in the stationary boiler/ steam plant. But are some of these accessories also used in the locomotives as well? or are there specific 'accessories for steam accumulators', which are used on the locomotives?
    When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car

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    Rusted SriramEfunds's Avatar
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    Wonderful to read about the steam locomotives, if I'm not wrong had traveled hardly few times when I was a kid. Subscribed!
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    psr
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    Quote Originally Posted by Saerius View Post
    Also asking just to be sure, the pistons of the front and rear are not pressure linked, or mechanically linked, are they? do they work in synchronisation eg: like two v8s mechanically coupled or are they mechanically dis sync v8s having independent gearboxes and transfer-cases? In case the driver gave too much throttle and the wheels of the front driving unit starts to spin and lose traction the rear unit will still maintain traction due to the load transfer?

    Psr sir the pic of the superheater isnt showing.

    Boiler type mountings will be used on the steam accumulators of the fireless locomotives and boiler accessories will be used in the stationary boiler/ steam plant. But are some of these accessories also used in the locomotives as well? or are there specific 'accessories for steam accumulators', which are used on the locomotives?
    The Steam Loco Cross section is now visible...
    In the Mallet type articulation the pinion gives horizontal flexibility to follow the rails through the curves without destroying them.The Pinions are routine,repeat maintenance item..
    First off the Big Boy is not a true Mallet type Steam Configuration...
    The first compound-compression locomotive with an articulated pair of drive wheel assemblies was designed by Swiss engineer Anatole Mallet (pronounced "Malley") in France. The front driver assembly included two low-pressure cylinders. The rear driver assembly included two high-pressure cylinders. The single boiler was rigidly attached to the rear driver assembly. Mallet locomotives in the USA followed the design created by Anatole Mallet and were called Mallet locomotives as a result. Like Anatole's original design, these locomotives used compound expansion where steam was first used the the two high-pressures cylinders and then exhausted to be used a second time in the two larger low-pressure cylinders in the front of the locomotive.
    The USA later experimented with the same basic design but with four high-pressure cylinders. These were still articulated locomotives but were no longer true "Mallets" because they used simple expansion instead of compound expansion. Unfortunately, no good name for this design ever emerged, and they tended to be loosely called 'Mallets' as well.
    Anatole Mallet designed a steam locomotive with two important characteristics. His design of locomotive,...was articulated, and,used compound expansion (high and low pressure cylinders)
    The Big Boys,as well as many other articulated steam locomotives, used simple expansion (high pressure cylinders all around), and thus, according to the strictest definition of the term, are not true mallets.
    Here are some images of fire less locomotives..

    Excepting for the fact that there is no fire box,and less power, the Fireless locomotive was almost the same as the regular Steam Loco
    Last edited by psr; 06-01-2012 at 08:17 AM.
    When Was The Last Time,You Did Something For The First Time.

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    Rusted Rahul.Gvli's Avatar
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    Thank you so much for this vast information psr sir...

    Subscribed...
    Originality is the art of hiding your sources...

  9. #19
    psr
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    Quote Originally Posted by SriramEfunds View Post
    Wonderful to read about the steam locomotives, if I'm not wrong had traveled hardly few times when I was a kid. Subscribed!
    Quote Originally Posted by Rahul.Gvli View Post
    Thank you so much for this vast information psr sir...

    Subscribed...
    Thanks for the appreciative words..
    My first exposure to steam came ,when i was 6 yrs old... My Father took me to the station,and to a Steam Loco standing on the siding.The Fire man and Driver lifted me into the Loco..I was trembling with excitement and looking with wide eyes at all the gauges,levers etc..Like any kid The first thing I did was Blow The whistle, and then tried to feed coal into firebox with a shovel...I couldn't even lift the shovel and the driver and fireman kept laughing...I picked up two large coal pieces in each hand and demanded the firebox be opened,which they did...I threw the coal inside and got a blast of heat on my face..I was petrified with fear at the sight of fire and heat and at the same time felt 10 feet tall ,having done my job as a fireman.....the infatuation with Locos continue till to-day.
    Last edited by psr; 06-01-2012 at 12:02 PM.
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  10. #20
    psr
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    Quote Originally Posted by Saerius View Post

    Also asking just to be sure, the pistons of the front and rear are not pressure linked, or mechanically linked, are they? do they work in synchronisation eg: like two v8s mechanically coupled or are they mechanically dis sync v8s having independent gearboxes and transfer-cases? In case the driver gave too much throttle and the wheels of the front driving unit starts to spin and lose traction the rear unit will still maintain traction due to the load transfer?
    Your query actually deserves a lengthy explanation on different mechanism involved in Articulation, steam distribution between cylinders,and flexible joints....I am giving a link which explains all in detail...go through the contents carefully,and you will be happy you did..

    Mallet Articulated Locomotives
    When Was The Last Time,You Did Something For The First Time.

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