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The Sulphite Railroad Bridge, also known locally as the Upside-Down Covered Bridge is a historic railroad bridge in Franklin, New Hampshire. The bridge was built c. 1896-7 to carry the tracks of the Boston and Maine Railroad across the Winnipesaukee River between Franklin and Tilton. It is located about east of Franklin, and about south of US Route 3, and crosses the river at a point where its banks are quite steep; it is not readily visible from any roadway, but may be seen from the Winnipesaukee River Trail. The bridge is long, and consists of three spans, each supported by Pratt trusses resting on granite piers or abutments. The main central span measures . The bridge is believed to be the only surviving "upside down" covered railroad bridge, in which the rail bed is laid ''on top of'' the bridge roof, whose purpose is to shelter the trusses below. The railroad line was shut down in 1973.〔(【引用サイトリンク】title=NRHP nomination for Sulphite Railroad Bridge )〕 The bridge was listed on the National Register of Historic Places in 1975.〔 The bridge is not in good condition, having been subjected to graffiti, vandalism, and arson, as well as the elements. ==See also== *List of New Hampshire covered bridges *List of bridges on the National Register of Historic Places in New Hampshire *National Register of Historic Places listings in Merrimack County, New Hampshire 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sulphite Railroad Bridge」の詳細全文を読む スポンサード リンク
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