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| axleload = | traction = | engine = | enginetype = | cylindercount = | cylindersize = | traction motors = | poweroutput = | tractiveeffort = | transmission = | acceleration = | deceleration = | aux = | powersupply = | hvac = | electricsystem = | collectionmethod = | uicclass = | aarwheels = | bogies = | brakes = Air (EP/Auto) | safety = | coupling = | multipleworking = within Classes 303–312 | light = | gauge = | notes = }} The British Rail Class 309 "Clacton Express" electric multiple units (EMUs) were built by British Rail (BR) York Carriage Works from 1962–1963. They were initially classified as Class AM9 before the introduction of TOPS. These units were the first express 25 kV alternating current (AC) units to be built by British Rail, and British Rail's first EMUs to be capable of 100 mph. ==Description== Twenty-three units were built in three different configurations: *601–608 – Two-car units (309/1) *611–618 – Four-car units containing a griddle car (309/2) *621–627 – Four-car units (309/3) Each unit had identical electrical equipment. The original concept called for increasing the power-to-weight ratio when strengthening trains from eight to ten cars in peak periods using the 2-car units, in order to make the peak timetable more resilient. 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「British Rail Class 309」の詳細全文を読む スポンサード リンク
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