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[quote user="ACY"] 7. A pin-connected single track through truss bridge. Maybe this could be a modification of the Central Valley bridge.  This would be ideal for lightly traveled lines or older installations.  [/quote] The Central Valley 150' truss bridge is already a pin-connected bridge: <a href="http://www.railroad-line.com/forum/data/Thorn%20Creek%20and%20Western/201433113453_Truss%2003_lg.JPG">http://www.railroad-line.com/forum/data/Thorn%20Creek%20and%20Western/201433113453_Truss%2003_lg.JPG</a> To get an early one you need to exchange the bottom chord's channels for eye bars. Here is a thread showing the conversion: <a href="http://model-railroad-hobbyist.com/node/16673">http://model-railroad-hobbyist.com/node/16673</a> If you want to run heavy diesel locomotives on the bridge you should consider to leave the bottom chords in in the two outer panels as is and to replace only the inner two panels with eye bars. Reason is: In the outer chords the relatively low tensile stress is superimposed by larger compressive strength from e.g. braking. The resulting compressive strength can lead to buckling of the eye bars. <a href="https://www.johnweeks.com/river_stlouis/pages/stlL18.html">https://www.johnweeks.com/river_stlouis/pages/stlL18.html</a> regards, Volker (Germany)
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