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Ross,

 

From the picture that you texted me, it appears that one pickup roller is reversed.

 

First, the little black insulator should have a peg that fits in a hole. It only goes in one way.

 

Next, each pickup roller assembly should screw in so that the little wings and the hole align with the insulator.

 

This should result in the screw end of the pickup roller assembly pointing to the middle of the engine and the roller pointing to the end of the engine, or vice-versa. Regardless, the two assemblies should be pointing in opposite directions.

 

That way

 You have a 2 rail engine running on 3 rail track. Notice the fine flange on the drivers. We can't  see the flange on  front pony trucks  or below the cab.??  I'm  not sure if you have the rollers in the right position. Maybe try reversing them so the rollers are near the ends of the engine and not in the middle.   When you push down  on them how far do they go? Far  enough so they're not lifting the engine a bit. I couldn't find much info  on the MTH web site.

Hello Ross

I don't know if I can help,maybe Barry is not available right now. Can you run the Locomotive again and when it derails  take a picture of the derailment so we can see the locomotive wheels and track. post it here I will try to help. I have a two rail MTH steamer I run on three rail track.

 

Clem 

Originally Posted by Ross Gerami:

what is IMO wheels?

What gunrunnerjohn said  (he posted while I was composing my reply)

 

Your derailments are due to the type of wheels your locomotive is equipped with. Compare the photo of your locomotive's wheels with this one:

 

berkshire closeup

 

Notice how much larger the flanges are on the outer wheels, and the absence of flanges on the inner wheels. This is what allows this particular locomotive to run on rails that have round-topped heads, on curves as sharp as 0-42 (21" radius).

 

Your particular locomotive was equipped for 2-rail track, which always has flat-topped rails, and typically much wider curves. Even though your loco can be switched to operate on 3-rail track, that capability is just due to common parts that allow the same locomotive to be marketed to European O scalers (who as a rule run 2-rail almost exclusively) as well as U.S. operators (who operate a mixture, heavily biased toward 3-rail with round-topped rails and sharper curves)

 

Your derailments are due to the wheel flanges climbing over the Fastrack rail heads, (which are round on top), helped along by having flanges on the center wheel, which prevents it from moving sideways over the rails in a curve. Your locomotive being equipped with 2-rail wheels, will need at least 0-84 (42" radius), according to the MTH catalog. That would mean Gargraves, Ross, Atlas-O or MTH Scaletrax (all of which are equipped with flat-topped rail in curvatures wide enough for your loco) should you choose to continue operating this engine as a 3-rail unit.

 

While this locomotive is also available with wheels compatible with rounded-top rails and could theoretically undergo a wheel swap, I don't know offhand if MTH makes them available for this particular unit. 

 

---PCJ

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  • berkshire closeup
Last edited by RailRide
Yes that was a good thought that Gregg came up with.
 
Originally Posted by RailRide:
Originally Posted by Ross Gerami:

what is IMO wheels?

What gunrunnerjohn said  (he posted while I was composing my reply)

 

Your derailments are due to the type of wheels your locomotive is equipped with. Compare the photo of your locomotive's wheels with this one:

 

berkshire closeup

 

Notice how much larger the flanges are on the outer wheels, and the absence of flanges on the inner wheels. This is what allows this particular locomotive to run on rails that have round-topped heads, on curves as sharp as 0-42 (21" radius). Your particular locomotive was equipped for 2-rail track, which always has flat-topped rails. Even though your loco can be switched to operate on 3-rail track, that capability is just due to common parts that allow the same locomotive to be marketed to European O scalers (who as a rule run 2-rail almost exclusively) as well as American (who operate a mixture, heavily biased toward 3-rail with rounded rails and sharper curves)

 

Your derailments are due to the wheels climbing over the Fastrack rails, (which are round on top), helped along by having flanges on the center wheel, which prevents it from moving sideways over the rails in a curve. Your locomotive being equipped with 2-rail wheels, will need at least 0-84 (42" radius), according to the MTH catalog.

 

---PCJ

 

I had an MTH Mikado that was 2-rail/3-rail.  While it seemingly was equipped for 3-rail, it simply refused to run on tubular or Fastrack, it would derail in about every third curve.  It did run on Atlas track fine.  In comparing the flanges on the wheels with other engines, it was obvious that they were thinner.  They didn't look like the 2-rail engines I have had here for repairs and upgrades, but sort of in between.  Nothing I could come up with would fix the issue, so I finally sold it.

 

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