The Portsmouth Direct Line Expansion Pack is a recreation of the 49-mile railway line between Woking and Portsmouth Harbour via Guildford. Based on the line as it appeared between 2000 and the present day, this expansion pack includes the Class 450 electric multiple unit (a very familiar sight on the line) and faithful representations of all 16 stations along the route. The Portsmouth Direct Line runs through busy urban centres, suburbs and rural areas as it makes its way from Woking in Surrey across the North and South Downs to the historic naval town of Portsmouth on the South Coast. The line was first begun in 1845, at which time the steep gradients of the Downs between Guildford and Petersfield proved a struggle for steam traction. Journey times improved with the electrification of the line in 1937, and by the late 2000s the third-rail 750-volt DC line was served predominantly by Class 444 and Class 450 EMUs.