Transport: The Railways That Built Britain, With Chris Tarrant, 9pm, Channel 5

The rail network played a vital part in the two world wars of the 20th century, keeping supply lines open and transporting troops to and from the front line. In this episode, host Chris Tarrant (right) looks at how railway works were converted into munitions factories during the First World War while in the Second World War the evacuation of a million children was aided by the railways.