The top photo shows the track as laid, cleaned with a fibreglass brush before painting to remove any dirt or flux.
Using Track Colour Acrylic paint this was applied neat to the rail sides and chairs. I reserve judgement on the use of this type of paint, always having used enamels on previous layouts.
Coverage seems not as good but will let it harden overnight before a final judgement is made.
Engine stand areas will be painted darker brown or black.
The lower photo shows the effect given when painted. A tad light but I think will be ok once ballasted.