Articulated engine curve problem

All curves? or only some curves? both locos same place? Check out the track thoroughly and then put them up on the blocks to see what is going on under there!

Is there a grade involved in the trouble spot?

Not much one can help you with.  This is the kind of problem where you have to observe closely in very slow speeds to see what happens to catch the error yourself.  Trial and error is the remedy.

.....

Dennis

Dennis:

Thanks for the reply.  I disagree.  The issue is not with track.  There is something about how these engines are engineered that allows them to hang up on themselves rather than return to neutral position.  Since I have had it happen on two engines in multiple scenarios, someone else must have encountered it before.  Someone smarter than I am who has engineered a way to modify the engines.

Flying blind, here - but I fixed what -sounds- like a similar/same problem on an older

Williams scale brass Challenger a few months ago. Under the smokebox was a recessed area

that would hook on one of the front steam pipes (072 curves) and keep the boiler from straightening out. Didn't always derail, but pretty odd-looking!

So:

1 - determine what is catching on what; just observe and observe. No one can fix

this if the cause is not known.

2 - if you see that you are having a problem similar to mine, the solution can be as simple

as a bit of filing and/or grinding. I took my boiler off and filled (with styrene) the recess

under the smokebox that was catching the steam pipe. I could have worked on the pipe,

but I liked the other way better. For you, it may be as simple as a bit of judicious filing on the edge of one of the parts.

Some articulateds have a centering spring that may be a bit strong...?

Best I can do flying blind; discovering that this is -not- your problem is also progress. 

Is the track flat or on a grade?

Does it occur in both left hand curves and right hand curves?

Is it the lead truck?

Is it the lead engine?

A picture of it?

You are not providing enough information.Let's see a video of this problem.Nick

Good evening 

Place the locomotive on its wheels on a table top, then move the wheels as if in a turn and see what hangs up? I do this with my locomotives to see what I have in the way of movement.

Clem 

davidbross stated: 

"Dennis:

Thanks for the reply.  I disagree.  The issue is not with track.  There is something about how these engines are engineered that allows them to hang up on themselves rather than return to neutral position.  Since I have had it happen on two engines in multiple scenarios, someone else must have encountered it before.  Someone smarter than I am who has engineered a way to modify the engines."

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If engineering were the problem this forum would be swamped with the same camplaint.  So far... Just you.