johnnybsoaring...
its a gauge problem with the #5's
i'm not sure on the #7's as i've never tried them out.
the tolerances are very tight.
unless the loco/rolling stock wheels are absolutely in gauge,
they end up (usually) riding over the guard rail.
sean,
i look forward to your pics.
thats an awesome plan you've got and i'd love to see the loooooong trains you'll need to fill those yards