A contemporary documentary on the railway line in Southern England that links two very different cities: Bristol was covered in 'Cardiff To Portsmouth, The Railway Today' so we start just outside at Keynsham, now just a dormitory town for its larger neighbour, but where once chocolate bars were despatched across the country. Next, it's a run along the Avon valley to the Georgian city of Bath. Here we look at the city, the old Green Park station and view the trains from the heights of the surrounding hills. We catch a new CORADIA high speed DMU and have a ride in an example. We see who is running the waste business for BANES, and then head east alongside the K&A, the Kennet and Avon canal. Down the Avon valley towards Bradford via Avoncliffe and on to Westbury. This is the centre for the Mendip stone trains, where you will literally see mountains on the move! We visit the famous White Horse for some spectacular views of the west country mainline and the cement works! Heading south, the line is a favourite for steam train operators over the famous Upton Bank and then down the Wylye valley. At Wilton we take to the air for some views of Wilton House and the rail served 'Whiting Works' before Salisbury is reached. Again, we get some super aerial views of the station, the SWT maintenance depot and, naturally, the Cathedral- with the tallest spire in the British Isles. On to Southampton where we discuss the container revolution, see at close quarter ships being loaded and cars and vans being moved for Ford. We conclude our tour at Portsmouth; where in addition to travelling on a new Electrostar we pay a visit to the old naval dockyard and HMS Warrior.