The Irish Army continued to use them for troop transport throughout the Civil War period, but they were worked hard and appeared to have received little care: of 454 originally supplied, only 57 were in service by 1926 with a further 66 being overhauled or repaired.
They were commissioned by leading British motor manufacturers to produce their official mascots; these included the Star Motor Company, Crossley Motors, Alvis Car and Engineering Company, Rolls-Royce Limited and Bentley Motors Limited.
The trolleybus fleet peaked at 119 vehicles, including Crossley Empire, British United Traction RETB1 (in various forms) and Volvo B10M and B58 models.
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Associated Commercial Vehicles (ACV) was founded on October 1, 1948 by the United Kingdom based vehicle manufacturer Associated Equipment Company upon that company's purchase of the motor manufacturers Crossley Motors & Maudslay Motor Company; at which time ACV became the holding company for those concerns and the manufacturing business of the Associated Equipment Company itself that was renamed AEC Ltd.