QUOTE: Originally posted by locomotive3 http://www.nmra.org/beginner/couplers.html http://www.kadee.com/conv/list.htm Recommended tools. http://www.kadee.com/htmbord/page120.htm http://www.kadee.com/htmbord/page160.htm MR did a review on the AC4400CW back in may 97 "Although it will go around 18" curves, the chassis mounted couplers may cause derailments because of the swing on curves. The AC will operate much better on 22". What's your radius? This particular 1997 review recommended Kadee #27 but their site for the dash 9 recommends http://www.kadee.com/conv/pdf/k153.pdf