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, they replaced 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. This book takes a look at the 135-strong fleet and the routes they operate.