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And how did I come to learn this little gem?  I had the same problem with a diesel engine.  It would stall on switches.  I checked continuity and everything seemed ok.  In checking my rollers I had noticed that they were not spinning freely so I put one drop of oil on its axle and wiped up all excess.  That was 2 years ago but since then I lube every roller with just one drop of oil.  If you look at the old Lionel manuals they stated to lubricate the rollers.  I guess they knew what they were talking about

I always lube the rollers, maybe why that issue hasn't gotten me.   I still have a couple that the spacing of the rollers causes issues over switches.  Since they both happen to be PS/2 locomotives, I can just add the wire internally to the tender from the pickups on the tender, job done.  The power comes over to the PS/2 boards, and there's even a convenient empty spot for a second center rail wire, I slip a contact into that.  I also recommend a PTC in the 4-6 amp range in series with the added pickup wire to guard against derailments shorting the rollers between the tender and engine.

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