These rail ties were designed around PECO N scale track. They have a wood grain detail for added realism. They fit perfectly with PECO Turnouts when combined with my Switch Stands
https://www.shapeways.com/product/UMFWPTYJ2/n-scale-switch-stands-2-pack?optionId=304508457&li=shops
They also can be used as excellent track side detail.
Gap Fillers:
https://www.shapeways.com/product/ZNWB7DWAK/n-scale-peco-track-gap-fillers?optionId=304505150&li=shops