You might run a magnet over the track to pick up any left over steel wool particles.
the use of WD40 on track? some do some don't. I personally don't put fish oil on track. wd40 does have the ability to trap water between it and the metal it lubricates. so it's a chevy/ford question.
I have heard of folks putting a drop of smoke fluid on the track to help with connectivity, just a drop or two.
smoke fluid can also be used to clean the wheels on your locomotive.