page_title: British Rail Class 309
hierarchical_section_title: British Rail Class 309
caption_attribution_description: English: The front of a British Railway Class 309 train in Blue/Grey InterCity livery with modified front windows at London Liverpool Street station.
context_page_description: The British Rail Class 309 "Clacton Express" electric multiple units were built by British Rail 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 units to be built by British Rail, and British Rail's first EMUs to be capable of 100 mph.
context_section_description: 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.
caption: The front of a Class 309 train in blue/grey InterCity livery with modified front windows at London Liverpool Street station
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