Seeing that Atlas makes an expansion kit to increase the single track Pratt Truss bridge into a double track version, can an additional kit make it into a triple track bridge. Anyone try this? Is it possible?
A related question is what is the track spacing on the double kit?
Thanks.
Earl
Replies sorted oldest to newest
The add-on kit includes an additional bridge deck and replacement twice the length cross braces for the single length braces used between the trusses. You will need to combine the two to produce a three times the length brace.
These braces carry no load. The load is carried by the deck.
It may not be prototypical. I've never seen one that didn't have an addition truss.
Jan
Actually, the double track isn't prototypical in that the trusses as modeled are designed for single track and couldn't carry the load of two, much less three, tracks.
Making new perpendicular cross-braces would be a challenge; making new angled ones would be a very much more difficult one!
By the way, despite Atlas' mislabeling, the bridge is a Warren truss, not a Pratt.
Here is a link to a page on the prototype:
A look at the Atlas double track bridge. Note the round locking pins that connect the sides to the deck. The deck has a lot of metal bar for support.
All parts installed. (Some assembly required)
Thanks for the input folks. I'm inclined to use three separate bridges, maybe even staggering them, but still considering at least one double. I'd like to use them on a module for our club layout. Anyone know the track spacing on the double?
Atlas' standard 4.5" center-to-center.
Great bridges ! 
Access to this requires an OGR Forum Supporting Membership
