I have a new 2-6-0 Mogul loco.  It derails frequently, (my General 4-4-0) does not.  I noticed the tender slants to the left and does not align behind the loco even when all wheels are properly on track. When it derails, it jumps off track on the left side.  Do need to return the loco for another or can this one be repaired.  The loco has not fallen off the table to the floor, it just derails at the point and remains up-right.

Larry