a couple years back my dad passed down to my the Lionel trains he had from when he was a kid. O and HO gauges. i've never run the HO, only the O. and my dad never set up the HO either. the O track needs some cleaning. 2 years ago i set it up and the transformer needed the plug replaced. set up the track last night and nothing, so i'm assuming cleaning is necessary (there is visible grime on the tracks).