MOCpages : Share your LEGO® creations
LEGO models my own creation MOCpages toys shop 4-8-8-4 "Mallet" Steam Locomotive, Versions 2 & 3Engines
Welcome to the world's greatest LEGO fan community!
Explore cool creations, share your own, and have lots of fun together.  ~  It's all free!
4-8-8-4 "Mallet" Steam Locomotive, Versions 2 & 3
My second and third Mallet compound steam engines.
About this creation
These are Versions Two and Three of my 4-8-84 Mallet Locomotives. They use the same base, cab, and tender, which is why I have only a few photos of Version Two. The big and noticeable difference between the two is the boiler. Version Three has some extra details added in, which will be pointed out. Other than that they are basically the same.
While finishing Version Three, I realized that I wanted my personal steam locomotive to be even bigger, meaner, tougher, and more powerful. So I threw the 4-8-8-4 design out the window and went with something ridiculous. So, again, neither of these are my personal locomotive.



This is Version Two. The boiler is much bulkier than Version One or Three. It looks mean and tough, but it is a tad too bland for my quest of the ultimate steam locomotive. I am crazy, I know. Thank you.



A more detailed look at the front. The bottom two lights are able to accept the Power Functions Light.



The rear end of Version Two. A ladder and rear light are featured on the tender.



This is Version Three. After I built Two and did not like the look of the boiler, I ripped off the boiler and added something a tad more traditional. The result is a sleeker design that looks much more general purpose.



The front end of Three. In addition to the bottom lights, the top lights are also able to be lit.



The rear end of Three. The tender has the added railings on top, which break up the bland design of Two.



The front features a number board on each side, although they are hidden from side view by the cowlings. The cowlings are the same from Version One. I liked the cowlings from One, so I decided to use them again.



The lead truck is a Power Functions Train Motor and articulates from the front set of drive wheels. This marks motor number one.



The front set of drive wheels. I added more details to Three than I did on Two. Two simply has the upper pipes, while Three has the added single pipe detail in the middle and some added piston detail. The pistons on Two and Three are significantly larger than One. As stated on One, a larger locomotive needs larger pistons.



The rear set of drive wheels and the trail truck. The trail truck is also a motor, making the current count at two.



A side view of the cab. The original design came from jd davis. I made a few interior and exterior modifications.



The back view of the cab. On both Two and Three I changed a few items on the inside, such as a spot for the power cables to be run through. Two has basic steps on the back, while Three has more detailed steps and the bars on the side.



The tender, once again, uses the 3 axle trucks by Mike Kollross. I have become quite fond of this truck design and will use it extensively in the future. The tender marks the final two motors, making Versions Two and Three have four motors. That should be a lot of hauling power.



The top of the tender is removed to reveal the interior. Inside is plenty of room for a Battery Box in the front section, an IR Receiver in the middle, and a Control Switch in the rearmost section (if it is needed to ensure that the motors run the same direction).



A photo of Version Three showing off her articulation. For a large locomotive, she can turn quite well.



As per request by jd davis, here is a front group photo of my two large locomotives and his two Big Boys.



Another group shot.



A top view shows that my two are longer than his freight locomotive, but not quite as long as his passenger one. I will get you next time, jd!



A side view. If you look closely, you can see that Version Two is the tallest. At least I win this round.



A final parting shot featuring the four large locomotives.



I would like to give a special thank you to jd davis for his help and advice in designing these locomotives. They were very fun to build, especially since I wanted to see if in what ways I could outdo jd. Yes, I am starting a friendly competition, which is just a mere obstacle in my quest for the ultimate steam locomotive. [Insert "Evil Laugh" Here]
Also, thanks to Trevor Young for his advice that he gave me on my Failed Locomotive Design. I had found the 3 axle design earlier, but his comment solidified my decision to use it.


Building instructions
Download building instructions (LEGO Digital Designer)

Comments

 I made it 
  December 5, 2012
Quoting jd davis well accually i just dug up the original blueprints i made for this design and with the repressurized steam that powers the 2nd through 6th driver sets, the repressurization system injects a precise amount of unused stem into the cylinders.
"Dug up the original blueprints"? What kind are we talking about? I am curious on that one. And I know that whenever you recycle an energy source pretty continuously, you get a loss of either energy, matter, etc. Not saying that the Mammoth is UNpossible, just UNprobable. It would have to be engineered just right. But for LEGO I am sure that it would work just fine.
 I like it 
  December 4, 2012
well accually i just dug up the original blueprints i made for this design and with the repressurized steam that powers the 2nd through 6th driver sets, the repressurization system injects a precise amount of unused stem into the cylinders.
 I made it 
  December 4, 2012
Quoting jd davis well technically the boiler only has to power the first and last driver sets as the rest use repressurized exaust steam from the two.
And therein lies the problem with going more than a compound duplex. Repressurizing and recycling the exhaust will result in eventual power loss. It is similar to Newton's Cradle in the fact that IN THEORY it should go on forever, but energy is expelled and lost (primarily due to friction and not exact alignment) with each hit. Similar affects would occur with a multiple drive wheel and pressure cylinder setup. Eventually the steam will reach the last set and provide practically zero pressure/power. How many sets that is or what the exact power loss would be, I am not sure. I am not a scientist/brainiac/whatever.
 I like it 
  December 4, 2012
well technically the boiler only has to power the first and last driver sets as the rest use repressurized exaust steam from the two.
 I made it 
  December 2, 2012
Quoting jd davis speaking of it looking as if it could work, do you think that it could be possible for the Mammoth to work if it was acually built in full scale?
Honestly, most likely not. The largest steam locomotive in the world, the Union Pacific Big Boy, was a duplex. Any triplexes that were produced were not that successful as main line locomotives due to the boiler not being able to produce the amount of steam that was required. This led to a substantial loss in power very quickly. However, they were able to produce an immense amount of power initially, and thus were primarily used as pushers. I hope that this answers your question.
 I like it 
  December 2, 2012
speaking of it looking as if it could work, do you think that it could be possible for the Mammoth to work if it was acually built in full scale?
 I made it 
  December 2, 2012
Quoting jd davis How big is this engine going to be anyway???
Well, the new one will be a 10-wide, whereas my 4-8-8-4s have been 8-wide. Length and heighth have not been finalized yet since I keep changing stuff around. Like I said, I am going for ridiculous, but also for something functional that looks like it could work if it were ever a real locomotive.
 I like it 
  December 2, 2012
How big is this engine going to be anyway???
 I made it 
  December 2, 2012
Quoting Trevor Young Hey nice locos. Very nice. And Im glad my advice was useful.
Thanks and thanks! A more better one is in the works that should make these look puny. I hope, anyways. I am going from the norm to the radical and deep end with this design. Like I said earlier, there is no such thing as overkill. But out of Versions 1, 2, and 3, which looks the best? I prefer 3 since it looks the part of being a Class 8MT. It seems as though it could be both a passenger and a freight engine.
 I like it 
  December 1, 2012
Hey nice locos. Very nice. And Im glad my advice was useful.
 I like it 
  December 1, 2012
it should be able to go around corners quite well but i fear that the body of the engine will collapse in turns. (i finished it tady on LDD)
 I made it 
  December 1, 2012
Quoting jd davis im still thinking Wow from the first version so i don't know what to say to these. so you really want to have a contest with me. i highly doubt that you caan beat my Mammoth Boy in hieght and in length.:)
True, your Mammoth Boy is one long locomotive. However, there is always the concept of functionality. How well will it perform on real track?
 I like it 
  December 1, 2012
im still thinking Wow from the first version so i don't know what to say to these. so you really want to have a contest with me. i highly doubt that you caan beat my Mammoth Boy in hieght and in length.:)
 
By TF Twitch
Add to my favorite builders

7
people like this. See who.

2,355 visitors
13 comments
Added December 1, 2012
 


LEGO models my own creation MOCpages toys shop 4-8-8-4 "Mallet" Steam Locomotive, Versions 2 & 3Engines


You Your home page | LEGO creations | Favorite builders
Activity Activity | Comments | Creations
Explore Explore | Recent | Groups
MOCpages is an unofficial, fan-created website. LEGO® and the brick configuration are property of The LEGO Group, which does not sponsor, own, or endorse this site.
©2002-2014 Sean Kenney Design Inc | Privacy policy | Terms of use