Engine stalls on #8 turnouts and double crossovers

look very carefully at where the pickup rollers are in relation to the gaps in the center rail. I had something similar on a Ross Double Slip. I used copper tape from the craft store to elongate the connection on the plastic frog.  You really need to bend down and see where the rollers actually are touching at the time of cut off. I did notice that if I ran the engine fast, it would find a connection on the other side. 

I can't see your setup but is there an insulated section of rail on the curved section and it is not picking up hot?

I know this will sound crazy...and this happened on my layout...get that engine to die there...take a piece of wire, as long as you need for it to be...and touch the outside rail that you believe is dead...to another "outside" rail...another ground...that you know is alive and see what happens.

Everything I had made it through every turnout less my rotary...and I did exactly as described above and the rotary worked by hooking up another ground.  I don't understand why because it made no sense.

Is this an Atlas turnout? If yes, your loco is probably fine. Atlas turnouts are notorious for dead spots.

There are plenty of threads on how to fix them if you do a search

Rick O,

    You are absolutely correct, I will keep my FasTrack 072 CC Switches thank you very much.  As much as I like most of what Atlas makes, their switches are definitely not on that list, I am not into re-engineering/reworking brand new turn outs to use them on my layout.

PCRR/Dave

We had many engines do this, thought it was the pickups and added the power switching relays. In all but possibly one case it turned out to be lack of ground on one of the outer rails and the plastic frog in combination with the much hated rubber tires prevented the other side from completion of the circuit as well. Check to be sure all your outer rails are actually connected to the common.

If these are Atlas switches, I agree with Rick.  They are problematic, especially the ones that are a few years old.  They used a tiny gauge wire to connect between tracks and it's frequently broken or cooked.

If this doesn't have dual roller assemblies on each truck, I'd look at the option of adding them.

These are all Ross turnouts with power switching relays. This is a new PS3 engine with double roller pick ups. I just checked the spacing of the rollers compared to the 6 axle engine that works ok there is a difference of about a half in center to center

Are you using the relays to borrow an outside rail on the turnout and make it hot? 

  Join the outside rails together  approaching  the switch points and the tracks on each route.

Last resort , turn the engine around, same thing?

Gregg: Will try the turn around  DAH why didn't I think of that and try it?

We have the power transfer wired per Ross and Z stuff.  I think from what has been posted, it is a roller spacing issue on this one engine.  I had to reverse a roller on a Genset to get it to go through #4's on our ladder tracks. Thanks. 

This is a very common problem with engines with less pickup rollers and switches with longer dead spots.  You can attack it from either minimizing the dead spots (power routing) on the switches or adding pickup rollers to the engines or both.  But first you might want to use your electrical meter to be sure that all the rails are powered now.  There could be a rail that has lost contact.

Art

It's sometimes  hard to find the exact problem with these long switches and now 2/3 rail engines.  center rail pick  up or lost common? Anyway maybe let the engine stall . shut off  track power and gently lift the engine to see where  or what rail (if any) the rollers are touching.

  I'm sure you're made sure the rollers are all working with a continuity meter at the work bench..... 

On a #4? Wow! That is even "shorter/tighter" than a regular Ross switch!!