WOOHOO! Found the sweet spot for the Alan Curtis Models (ACM-AC020 RTR Gunderson 5-Unit Stack Car, 48' well). With the stops in place on the wells they are limited in operation which I didn't realize when I bought the kit. Last railroad I had too many tight radius and the intermodals were left to RUST in the yard. Now back in business!! This specific section is a tad over 15". It is the tightest radius on the new layout. Normal track will run 17" due to the 3 sections of 3' x 8' assembled together.