National Express and local bus services in the West Midlands under the Diamond Bus name. Go-Ahead had been known for some time to be keen to begin operating in the area. In February 2006 another operator in the West Midlands, Probus Management, trading as People's Express, was purchased. In August 2006, the Birmingham Coach Company (trading as Diamond Bus) and Probus operations were regrouped under the Go West Midlands Limited legal entity, with the bus operations branded as Diamond in the West Midlands. In February 2006 the Hants & Dorset Trim bus refurbishment business was purchased. In April 2006 the Govia joint venture commenced operating the South Eastern franchise as Southeastern. In September 2006, Docklands Buses was acquired and integrated into Go-Ahead London, followed in October 2006 by Marchwood Motorways which was integrated into Go South Coast. In June 2007, Blue Triangle was acquired and integrated into Go-Ahead London. In September 2007 Northumbria Coaches was purchased and integrated into Go North East, followed by Stanley Buses (the bus service subsidiary of Stanley Taxis) in October 2007, and Redby Buses in January 2008. In November 2007 Govia began operating the London Midland rail franchise. In December 2007 the Orpington services of First London were acquired. In February 2008, Go-Ahead sold Go West Midlands to Rotala's Central Connect, two years after purchasing the company. In June 2008 the Gatwick Express rail service was incorporated into Southern. In October 2009 East Thames Buses was acquired and integrated into Go-Ahead London as well as the Horsham operations of Arriva Southern Counties that were integrated into Metrobus. In December 2009 Plymouth Citybus was purchased from Plymouth City Council. In March 2010 Konectbus in Norfolk was purchased as well as the Hexham operations of Arriva North East and integrated into Go North East. American operations In August 2010, Go-Ahead America, a joint venture with Cook Illinois in which Go-Ahead held a 50% stake, commenced operating a yellow school bus contract in St Louis, Missouri. In July 2014, Go-Ahead exited the United States following the loss of its yellow bus contract. Since 2011 Acquisitions In May 2011, Go-Ahead acquired Thames Travel in South Oxfordshire. Acquisitions in 2012 were Carousel Buses (March) integrated into Oxford Bus Company, Essex-based Hedingham (March), the Northumberland Park-based operations of First London (March), Anglian Bus (April) in Norfolk and Suffolk, and HC Chambers & Son, Suffolk (June) (immediately operationally merged with Hedingham). In