Hi I need a little advice. I laid some O gauge track yesterday on my micro layout yesterday as I fixed it by glueing it to the baseboard. Now I weighted it down with some tins of food and when I removed them this morning the tops of the rail looks to have turned brown but not rusty. Will my track still be ok to use.
Sounds like the rail top has just oxidised, try wiping it clean with soft cotton dipped in meths or using a track cleaning rubber. Very often after I've painted my track for weathering the rail top can be cleaned by gentle polishing using fine grade wet and dry paper used dry. It shouldn't affect electrical continuity unless the rails are filthy dirty.
It’s the reaction of dissimilar metals probably exaggerated by the agents in the glue vapouring off as it drys Give it a good clean with a rubbber like this Fleischmann one in the link. I had a similar issue but with alloy wheels on a very old loco left it on a siding and a couple of days later the loco wheels became fixed to the peco rail with a white oxidation occurring it cleaned up Ok using the Fleischmann cleaning block http://www.allaboardexclusive.com.au/fleischmann-6595-cleaning-rubber-f-rails-ho-gauge.html