Di Smith enjoys train travel at its best aboard the Royal Scotsman.

Di is treated to some old-fashioned five star luxury when she boards The Royal Scotsman in Edinburgh.

The magnificent train, first launched in 1985, accommodates only 36 people in 16 twin and four single cabins all with individually controlled heating and feather duvets, among other comforts.

Meals are served in two dining cars and the observation deck allows passengers to step outside and breathe in the fresh air of the Scottish highlands as the train winds its way around mountains, through fields and past lochs.

The train slips into a siding at night to ensure a blissful slumber for all on board and sightseeing is included as part of the service.

Di strongly suggests travellers don't miss a visit to Mount Stuart, which is actually a grand mansion built in the style of Gothic revival, on the island of Bute.

The Royal Scotsman travels at a pace ideal for taking in the spectacular scenery, and lulling passengers to sleep. So it can be hard work staying on top of the outdoor and indoor attractions.

The grand interior of the train, and the fact that it is in the UK, lends itself to imaginings of mysteries of the Agatha Christie kind.

The train does not operate in winter.

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