I have a set of 7 Heavyweight passenger cars. They look nice but are very long. I am in the planning stages of my layout. problem is that there is one area where to fit what I want I have to place a 15 degree radius turn. The train is partially hidden at this point so cosmetics is not a main concern here. Will this tight of a turn with this long of a car cause derailments? It is on a ramp to a second level. All of the other corners have a radius of 20 (used flex track for those).