I have about 3-4 inches. 1) I normally do not run my trains fast. 2) The outside rails are O84 curves, I have run an MPC B&M GP-9 at full speed and it did not jump the track ( it was just a test to see how well it was operating, seeing I had just bought it and wanted to test it out. here is a pic of my only straight away not along a wall. Note this was during construction mode.
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