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I have this older P2K SD9. I bought it years ago and never ran it much on my old layout with all 18" radius, it always derailed. Now on my current layout with 22" radius and #6 turnouts it still has been a troublesome engine trying to get it to stay on the rails. This thing will derail on a straight section of flex track or with the slightest rise in a rail in a curve. I feel my My trackwork is very good as all my other diesels and med duty steam run like a dream. Are the flanges on some P2K models smaller than found on most other P2K's ? Im thinking that these trucks dont allow proper axel movement to let the wheels roll over any kind of rise or low point? Even running straight through a #6 turn out it will sometimes ride up on a frog or fall to the inside of the turnout
I misplaced my NMRA track guage a few weeks ago so will have to get a 2nd one. I did compare it to other P2Ks and the wheels seam in spec.? are there replacement wheels for these with deeper flanges?
Trent
Grandson of an ALCO Builder
2 questions:
1 does it sound noisy? a growl gear sound? if it does it may have a cracked gear on the one or more axels...sometimes when this happens it can make that axel buck off the track.
2 you answered this one yourself...gauge the wheels spacing....
no, this one does not have cracked gears ,not yet!!!
yep, I need to get that guage
I was just wondering if there was a known issue with these?
Trent
The Proto SD9 has very tight trucks. I haven't worked on one of them in quite a few years. It's one of my projects that fell through the cracks. I want to do one up as an N&W one of these days. But it seemed to me that there was not a lot of pitch motion in the trucks, and this is critical if your track is not 100% perfect and whose is? I think it would be relatively easy to loosen them up, but without dissecting one in front of me it's hard to say how. IMO the SD9 has an excellent drive - it was the first P2K loco with 14:1 gearing, which unfortunately they didn't stick with... until Walthers took over anyway. I'd be curious to see in what way the new Walthers releases are different.
Andy
Well, something is wrong there .. an SD-9, no matter who made it, shouldn't derail on 22" radius track...
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