In the heart of southern Bolivia lies a mysterious train graveyard, where the skeletons of British steam locomotives and rail cars rust away on the edge of the world's largest salt flats.

But unusually dry weather this spring has led to Network Rail banning steam engines from pulling trains in many parts of the countryside. There are fears that sparks from the chimneys could set ...

In the heart of southern Bolivia lies a mysterious train graveyard, where the skeletons of British steam locomotives and rail cars rust away on the edge of the world's largest salt flats.

But unusually dry weather this spring has led to Network Rail banning steam engines from pulling trains in many parts of the countryside. There are fears that sparks from the chimneys could set ...