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Miles per hour is the unit used on the US and Canadian rail systems.[32] Miles per hour is also used on British rail systems, excluding trams and some light metro systems.[33]
Nautical and aeronautical usage
Nautical and aeronautical applications favour the knot as a common unit of speed. (One knot is one nautical mile per hour, with a nautical mile being exactly 1,852 metres or about 6,076 feet.)
Other usage
In some countries mph may be used to express the speed of delivery of a ball in sporting events such as cricket, tennis and baseball.
^Some signs are explicitly labeled in miles per hour,[5] but most are either explicitly[6][7][8][9][10][11] or implicitly measured in kilometers per hour.[12][13]
^"Modern Living: Think Metric". Time Magazine. 9 June 1975. Archived from the original on 22 January 2011. Retrieved 2010. Meanwhile, the metricization of America is already taking place. Individual federal agencies, school systems, states and industries, as well as radio announcers, supermarkets, beverage bottlers and ballpark scoreboards, are hastening the everyday use of meters, liters and grams. ...a road sign outside Fergus Falls reads, ST. CLOUD 100 MILES OR 161 KILOMETERS. Other signs note that 55 m.p.h. equals 88 kilometers per hour.
^"A. Classes of Track". Rules Respecting Track Safety. Transport Canada. 3 November 2008. Archived from the original on 25 August 2012. Archived 25 August 2012.