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This week I picked up the Lionel 6-81749 Pullman Baby Madison 3-Car Set from Grzyboski's Train Store. Since the older 4-car Baby Madison set 6-81749 is rated for O-27 curves and from what I could dig up on various train forums, I assumed/hoped that this 3-car set would work on my O-27 layout, despite being rated for O-31.

When my purchase arrived, I was a little disappointed, but not disheartened, to discover that they derailed on curves. However, when I removed the coupler-end wheel set from the 6-wheel trucks, the cars ran fine. (I did not have to remove wheels from the tail-end of the observation car or the head-end of the combine, the latter of which is coupled to either an non-passenger car or the tender.)

I picked up some postwar axles and flange-less Madison wheels from the Train Tender, and when they arrived today, after a little bit of filing to shorten the axles, I was able to easily install them in the trucks. Much to my delight, they work as I had hoped.

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Last edited by Matt_GNo27
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Lionel did this on their steamers and you see it on some later diesels. I think it looks better if the centre wheels are flangeless if it will work out. Also sometimes it isn't the number of axles but the truck or coupler not being able to swing far enough because of a step or some such obstructing movement. I encountered this problem on a close to scale length car. One coupler just comes over far enough but the other one stops about 1/8 of an inch short of centre and causes the car to be pulled off the track.

midnightwrecking posted:

but the truck or coupler not being able to swing far enough because of a step or some such obstructing movement.

It was this. The flange would hit the step, limiting the swing of the coupler arm. If the passenger car is coupled to a "normal" car, e.g. a traditional freight car or tender, then the two cars can create a small enough angle not to derail, but with back-to-back passenger cars, the limit of coupler swing creates too big of an angle. For this reason, putting the flange-less wheel set in the center of the truck would not help.

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