When running my Walthers DCC EMD F7 A-B consist (both powered) on Bachmann NS EZ track with the Bachmann DC #44217 controller, at low speed, the pair always stops at a certain point in the 22" curve. At higher speeds it proceeds through with no issues. If I run the A unit only, this doesn't occur either. Both locos are fairly heavy and produce basic engine and braking sound effects. My other locomotives don't do this so it's not a track problem. Could this be an issue with the DCC locomotive pairing vs. the DC controller? Thank you for any and all replies.