Thanks. Good! After reading the other posts I was looking at my 18” Atlas through truss bridge. I have Unitrack running through it, which has a ballasted base. Now I can rest easy knowing it is indeed prototypical.Looky here...
and here (page 14 of 104)
I have two of these and whilst not the most accurate of bridges they suffice. My question is did these bridges have ballast between the sleepers?