>>9497669Here's a string of 40' boxcars on Kato's 381mm radius track, being pulled by a PA1/PB1 pair (The largest diesels I've got). Without the PAs you could fit another 3 40' boxcars on here for a total of 14 cars on a 30" diameter half-circle. For the trains lengths you're thinking of, you're gonna need at least a 5' diameter curve.