BOXCABS!

[nkalanaga]

A widened Z scale mechanism?  It looks close to the D&RGW's larger narrow gauge 2-8-2s

[pjm20]

From my notes, the D51s still are too big for a 44" dia driver. A stretched Roundhouse 2-8-0 might be your best bet. A .275" dia driver is what we are looking for.

[Lemosteam]

In this topic: https://www.therailwire.net/forum/index.php?topic=53010.0

The "DKS" flattened a pretty well detailed photo of a Long Island boxcab. I took that photo and "traced" it in AutoCAD to import into Sketchup. Apparently I have no idea how to use Sketchup, but I did spit out a 3D model of this loco.



This site has some good photos:
https://www.arrts-arrchives.com/ENG403.html

And this site:
http://members.trainweb.com/bedt/indloco/prrn4.html
These were my first test prints.



In N scale this thing is only about 1.5" long.

Shut up and take my money-

Have you determined a mech yet?  MUST. HAVE.

[Chris333]

Shut up and take my money-

Have you determined a mech yet?  MUST. HAVE.

Determination is on the printer right now 

The thing about the power chassis though. I have a couple of these sitting here: https://tomamw.miiduu.com/6151-nhoe009-dia60wb12mm-super-slow-drinve-unit-oso-power-0612-rtr-1

The 6mm wheels are correct, but the wheel base is too short. I need 18mm WB. So I am printing a new chassis block. After all the kit chassis itself is 3D printed. So I will strip all the parts from the Toma chassis and add a new longer 1mm layshaft. I'll have pics later on.

[delamaize]

@Chris333 how do you feel about Alco 2-8-2T Minarets?   
If I could identify a chassis with small enough driver diameter and an integrated drive (no tender, because there wasn’t one) that would be my unicorn.

I built one years ago, using a Walthers 0-8-0 as the mech. It's way too big obviously, But it does fit the bill. I'm looking for some pictures now. If I don't find any, I will get some the next time I dig it out.

EDIT: Found a few picture, The pictures are horrible, I think I took them with a potato. The model is not great either, Of course the model was built like 10 or 12 years ago, so my skills were not exactly where they are now:

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[Chris333]

How does that run without a tender for power pickups?

[Chris333]

The boxcab next to a 33' hopper:


Frame block with chassis mounted.



Chassis on the left is stock Toma Model Works. On the right is my own 3D "block" with Toma's parts on it.


And here is a video of the Toma chassis running:

[Lemosteam]

Amazeballs.

You astound me Chris. Seriously.

[Chris333]

Please excuse the HOn30 layout. 

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In the video there is no weight at all. The motor, layshaft, wheels, and screws are the only metal. I could have blown it over. I suspect that once full of lead it will run even better.

Needs moar 1930's George Sellios   

[bbussey]

OUTSTANDING.

[Mark5]

The boxcab next to a 33' hopper:

Magnifico!

[Ed Kapuscinski]

From my notes, the D51s still are too big for a 44" dia driver. A stretched Roundhouse 2-8-0 might be your best bet. A .275" dia driver is what we are looking for.

Only problem there: the MDC engines have their motors in the tender.

[wazzou]

Only problem there: the MDC engines have their motors in the tender.

Precisely.

[Lemosteam]

Only problem there: the MDC engines have their motors in the tender.

But this does not mean that a gear can't be added to the input shaft and a motor above that inside the shell of the tank engine after machining off the top of the chassis for room.

[up1950s]

Chris needs to be cloned and become required R&D enforcer of every model RR manufacturer of every scale and some not yet envisioned .  Critters are much more appropriate to model railroads , less disappointing with tractive effort  , and as such make small model railroads more prototypical .