Over the past few weeks, I have noticed that one of the tracks of my hornby set has been having frequent power cuts. I decided to clean the track with methylated spirits. As I have been doing this, I've noticed that the train (Virgin 125) that runs along that line has been having problems. As the Virgin passes the point just before the footbridge and its heading around the curve towards the station, it has been struggling to gain speed as I give it full power. Could this be because I've used the methylated spirits or is it just because its a four car train and its coming through the point?
I've never had this problem before using the methylated spirits. I've attached a photo of my layout. Anyone help would much appreciated