Keywords: NTS - Railroad Trestles - before.jpg Nevada Test Site Frenchman Flat <br /> The U S Army's 412th Engineer Construction Battalion erected five structures which duplicated the center sections of open-deck single-track truss railroad bridges for the Encore and Grable shots <br /><br /> Photograph taken before the test Nevada Test Site Guide http //www nv energy gov/library/publications/historical/DOENV_715_Rev1 pdf DOE/NV-715 Federal Government of the United States 36 799019 -115 936441 PD-USGov Upshot-Knothole Encore Upshot-Knothole Grable Plumbbob Priscilla Truss bridges in the United States |