Starting in the 1950s, the railroad overpass replaced many busy at-grade crossings. In the Los Angeles area, as in other large cities, there are many street and freeway overpasses. On my HO scale Los Angeles & San Fernando Valley RR layout, I wanted to install a modern looking overpass for the 1950s. Because of space, my overpass had to be a low-relief structure where the tracks will disappear under the bridge and into the backdrop. I modeled a generic, deck beam bridge from the late 1950s, using welded plate girder beams and concrete bents and abutments.
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机译：从1950年代开始，铁路立交桥取代了许多繁忙的平交道口。与其他大城市一样，在洛杉矶地区，有许多街道和高速公路立交桥。在我的HO洛杉矶和San Fernando Valley RR布局中，我想安装1950年代的现代外观立交桥。由于空间原因，我的立交桥必须是低浮雕结构，在该结构中，轨道将消失在桥下和背景中。我对1950年代后期的通用甲板横梁桥进行了建模，使用焊接的板梁，混凝土弯头和桥台。
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