I have this older Sd38-2 that a friend converted to DCC months ago. We ran it on the test track and it ran great. Needed a bit more power to make it move but it still ran smooth. Anyway pulled it out last night on the test track. It ran back and forth several times on the test track and then....nothing. So I push it a bit and then it goes again. It's fine until I shut things down and try to run it again later. So I thought I needed to clean everything. Cleaned the wheels and the track and it ran again. I hear you guys talking about wipers? Are those contacts that touch the wheels or something? Could those be bent???? My other engines run fine.