R15 will be to tight for those locos. The lower the number the sharper the curve. My 2-6-2 can make it because the wheels are small and close together. The 0-8-0 just barely makes it, that also is a short wheelbase for and 0-8-0. The locos you have are just to long to make the R15 turn without derailing.Can anyone confirm R15, R22 says a 90 degree turn and the inches of the radius? As you suspect I am a newbie!!!!
Norm, Jenks, OK