Since their introduction in 1984, the Class 150 series of Sprinter diesel multiple units have plied their trade across the UK - from Cornwall to Scotland and many places in between - replacing large numbers of aging 1950s-built rolling stock. The backbone of many regional and rural services in the UK, the Sprinters are a common sight on the modern railway network. Lifelong railway enthusiast and photographer Andrew Cole takes a look at the 135-strong fleet and the routes they operate in a series of rare and unpublished images, covering a broad geographical area.