outside use

Yeah I'd just use the blue rails, my son has some 'brio' wooden track, the plarail dd51 would not run on it, the track gauge was correct but the rails were borderline be too deep, it kept getting hung up on its axle casing, it would have probable benefitted from a bit taking off the top, I also heard somewhere that brio is produce the best wooden track as it's made out of a better quality of wood than other brands,

Best option I think, you probably got loads of spare track hanging around like most of us