well after a year of testing (playing) ,Im ready to start glueing down the mains on cork RB and loose the thumb tacks . briefly I have no real drawn up plan , more chicken scatches ,so please bare with me. two deck around the room (14x16) with a 3 turn helix in a pennisula blob ,the decks are space 12-15" and net a of total of around 280’ of main (including one deck & helix of 2 trk main & 1 deck of single trk main).One side of room is 12"-18 deep decks of scenic/mountain and the other side is 24" and 18" decks for Yard/industry,and a 60" wide topdeck over helix penninsula for more industry/town …oh and Im doing 50s-60s western rail theme
heres a few Questions I have 1. was thinking of a metal tower type bridge like keddie wye (micro eng.) on a inside curve (removeing a portion of top deck)of the scenic/mountain side of layout,but its two trk main & curves are 281/2 -31" radius ,could it work or would it look stupid ? 2. I never see too many two trk bridges ,so what would be typical for a say river crossing of the 50’-80’ rainge ? ,I have a couple of the atlas code 83 open truss kits (I glued em rather than the snap together) not a lot on detail I know but again 1 trk each not 2 trk,would these be used side by side ? …thanks Jerry ,Ill try and get a trk plan posted one of these days
Here is what I did. It is only single track, but the high bridge was made for double track and would have worked just fine. For the lower trestle I think I would have had the two tracks converge to go over the terstle, but a double track would have also worked.
Walthers makes a double track truss bridge, 933-3012.
On real railroads I have seen both double track bridges (several varities) and side by side bridges. I think that in most cases it depends on when the second track was added. If they knew that they wanted two tracks at building time, a double was put in. If added traffic later warrented a second track a second bridge was built. Though I don’t know which came first, I have seen two different type bridges next to each other, a truss next to a plate girder is the one that I recall. There are also many places that I have seen one “crossing” made up of different type spans, such as a truss in between two plate girders or many other combinations. In some places two rr’s share a bridge, in others each rr has their own.
Whichever way you choose, I don’t think you will be wrong.
thanks for advise ,I have ordered the jeff wilson book “bridges ,tressiles and tunnels” it looks like it may have some good info for me , but still open to advise …Jerry
