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Is this the sort of thing you were thinking of?
I have used it on several bridges on my layout, in fact the section behind the tower hinges upward to allow access into the middle. I used a pair of hinges from an old pasting table, called 'ladder hinges' there are pins that aline the section to the wall and I cut the track at 45 degrees in the direction of travel which keeps the track in line ( the train 'runs off ' the track, if that makes sense! )
The suspension wire is 10mm earth wire, the supports 6 mm earth wire set in an electric drill and 'tighter up ' , crimped and fixed to the 10mm with 15mm copper tube again, crimped on to the 10mm, the tray is self supporting, the suspension wire is just for effect.
The towers are therm blocks, sawn to shape with an old hand saw and glued together, with an expanding foam glue, who's name escapes me!
I made this bridge about 10 years ago and have not had to do anything too it, I have not ballasted the track but a piece of garden weed membrane under the track would stop it falling through the holes and give drainage to stop it becoming a canal!
It may have been a picture from 'David 1226' of this bridge that you remember?
I would recommend it as a bridge base ( mind you it does help having a commercial electrician as a son!)
Hope this helps
Dave
