When the Victorians were first building Britain’s railway system 150 years ago, one corner of the British Isles thwarted them – the Scottish Highlands.

In this five-part series, engineer and inventor Dick Strawbridge sets out to do what they couldn’t, the only difference being that he and his team of volunteers will be building a model railway track.

Stretching 74 miles from Fort William in the west to Inverness in the east, it will be the longest model track ever constructed.

But although it is miniature in size, the problems aren’t small.

The 56 train enthusiasts must find ways for the railway to traverse canals, dense forests and even busy town centres – and all in just two weeks.