I decided to put a loop of track around the tree this year. Put my 616 pre-war on the track, and powered it with a 1033 Transformer. The train seems to run fine but randomly will slow down to a crawl, speed up, or go back to the preset speed. I am wondering if this is something with the engine or the Transformer. Engine had recent maintenance, and the track is spotless. No high resistance joints or lack of continuity. I hooked up a voltmeter to the Transformer terminals while the train was running and it seems to vary randomly from the set voltage about 1 volt high and low.
Anyone have any ideas?