Steam Locomotive No. 844        page3            2011

Now that's what I'm talk'n about!! Those drive wheels are 80" in diameter and are massive to say the least.



Those drive rods are huge and look to be made out of stainless steel. The bore diameter of the steam engine is 25" and the stroke is 32". To give you a comparison your modern car engine has a bore between 3" and 3 1/2" and a bore of about the same. The smaller arm above the drive rods is called a main rod or connecting rod which converts the horizontal motion of the piston into a rotational motion of the driver wheels.



The fit and finish on these parts were impressive. I can't imagine how long it took someone to polish all that steel.



This was quite an interesting looking nut and was one of the only things small enough that I might be able to actually make because everything else was way to big.



This funny looking device is used to lay down sand in front of the drive wheels to help it gain traction in difficult conditions. That brown shinny stuff that you see is grease....and lots of it.



Here you can see the last set of wheels which are the same size as the front ones. You can also get an idea of how large this locomotive really is compared to the man standing on that ladder.


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