The Southern Railway was the smallest of the four railway companies formed in 1923. However it carried the largest passenger traffic of all with its enormous suburban system, which was rapidly electrified. By contrast its rural branch lines, which proliferated all along the South coast of England and the main lines from which they sprang, were worked by a wide variety of steam locomotives right up to the end of main line steam. Many of these branches survive today, forming the basis of numerous preserved railways and the rich variety of Southern steam locomotion is still well represented. Recorded throughout the last decade, this film recreates the experience of Steam in Britain on Southern Lines.