I found this for you, hope it will help
Do I Want Code 55 or 80?
Personal taste here, but there are some basic facts to consider:
- Code 55 looks more prototypical
- Some wheels flanges may roll on the ties on Code 55 (fix: replace w/ low-profile wheels)
- Code 55 offers a greater selection of turnouts than Code 80
- Code 80 offers Insulfrog turnouts; Code 55 does not
Both 55 and 80 are very high quality track, so that's not an issue. PECO's 55 is an innovative design that embeds part of the track into the tie, so you get .055" rail height without sacrificing rail rigidity. In Code 80 Insulfrog turnouts, some wheel treads may cause an electrical short on the insulated frog unless the heel rails of the frog are isolated with insulated rail joiners