Lionel Legacy SD70 B&O derailing

Maybe obvious questions you've already looked at:

1. Have you checked the traction tire to make sure it's seated in the wheel groove correctly?

2. Have you inspected the track in the area where the derailment is occurring to see if there is some sort of foreign material in the way of the wheel flange?

Can you post a picture of the engine stopped at the exact place it keeps derailing?

Steve & Ben,

Thanks for the quick replies.  I will do what you have suggested later this afternoon and report back.  I will also compare the traction tire of the two other Lionel units I have and see if there is anything noticeably different.  Thank you again,

John

Good luck fixing it. I don’t have any switches, but mine works well with o36, so it should run on o54. Here’s hoping you can get that beautiful engine back up and running.

John,

     Make sure your rear coupler cut bar is down, if it is up it may be interfering with the rear truck.

JohnB

Here is what I did.  

1. Checked the traction tire.  It was fine, properly seated.  Compared it to other Lionel SD70s, looked the same, I believe the traction tire is correct.
2. I looked to see if there was any debris in the area - none.
3. I took a picture and made a film to identify the location where the derailment was occurring.  I could see the outside truck riding up the rail.  This is the area of concern.  It appears the track has somehow widened.  I ran freight cars over with no engine and could not get the issue to repeat itself.  
4. I tried this with another Lionel SD70 , and the issue repeated itself. I realize in my original post, I said this hadn't occurred, it hadn't.  This must be something new - not an enhancement
5. The bar is down on the B&O - not the issue.

I will try some other locomotives tomorrow to see if this is more widespread or not.  Thanks for the help - much appreciated.

John

John,

   What kind of track are you using? If it is sectional can you easily replace the track section where the engine is derailing? Do you have a track gauge? If not take a clean piece of typing paper and rub it on a reaction of straight track then fold the paper so that you have a good section of the track stains on the paper go to the suspect section of track and see how the rails match up.

  Locomotives are funny I have a set of Legacy E8s that derail on my clubs switches but run fine on my friends layout. He has a set of both Williams and MTH E8s that never have a problem. Now that several SD70ACE locomotive are derailing at the same spot the track would be more of a suspect than before when it was only the new one derailed. Especially if your other SD70a are older and never gave you a problem before. Good Luck!

JohnB