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Track gauge in the United States
Originally, various gauges were used in the United States. Some railways, primarily in the northeast, used standard gauge; others used gauges ranging from to . As a general rule, southern railroads were built to one or another broad gauge, mostly , while northern railroads that were not standard-gauge tended to be narrow-gauge.
Notable exceptions were the railroads that predominated in the first part of the 19th Century in New York State, and the lines centered around Portland (Maine). Problems began as soon as lines began to meet and in much of the north-eastern United States, standard gauge was adopted. Non-standard gauges remain in use for some municipal and regional mass transit systems not requiring interchange of equipment.
==Broad gauges==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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