Chris Tarrant: Extreme Railway Journeys (C5, 9pm)

CATCHING a train in Canada is quite an experience. Some can be the length of city blocks, so little wonder staff have to roller skate from one end of the platform to the other to help load the vehicle. A journey from Edmonton to Jasper for example, is the sort of experience that lives with you forever.

That's a mere 194 miles, which is modest compared to some of the epic journeys Chris Tarrant has been making in this series.

Of course in the early days, when Canada was a vast wilderness, creating the rail system was a back-breaking affair.

In the last episode of this run, the veteran broadcaster discovers how a 2,500-mile transcontinental railway was built against huge odds in just a few decades.

His journey starts on one of the earliest sections of track to be built, taking him deep into the Canadian wilderness on a train that is now a lifeline for local hunters and fishermen. In the middle of nowhere, he flags down one of world's biggest trains, the Canadian, and heads for the Prairies.

Near Winnipeg, he meets the descendant of a pioneering Yorkshire family who arrived here to start a new life more than a century ago. Later, Chris travels on the world-famous Rocky Mountaineer train, and completes his journey at the port of Vancouver on the Pacific coast.

The sight of two-mile long freight trains unloading their cargo on to supertankers obviously loses a lot on the small screen, but gives you some idea of the importance of the Canadian Pacific Railway, and why it is now one of the most important in the world

As you might imagine, making these shows can be an exhausting affair. For series one alone, Chris flew on 33 planes in five weeks, and season two has been just as taxing. However, in case you're wondering if Tarrant is whisked off to a posh hotel every night when he seems to be in the middle of nowhere, not a bit of it.

"No, I quite like all that actually. Somebody said to me: 'I bet you had make up and you were being pampered.' I don't think so," he laughs. "When you see it there was no way I was being pampered at all. It was very rough and ready but I quite like that. I'm a fisherman. I sleep out on banks so I didn't mind that stuff."

This series is just the latest feather in the cap of a man who has spent more than 40 years in showbusiness, from the anarchic days of Saturday morning favourite Tiswas, to the success of Who Wants to be a Millionaire?

George Clarke's Amazing Spaces (C4, 8pm)

DELAYED from a week ago, the series finale finds the amiable host meeting a father and daughter who are turning an American school bus into a festival campervan. He also heads off to Germany to meet a young dad who has turned a grain silo into a home. However, the question on many a fan's lips is: will George and Will's floating beach hut work? After months of construction work, the moment of truth finally arrives as it is launched onto the open sea. However, Will has come up with a contingency plan just in case; he has added an escape pod made from an old bath.

Class of 92: Out of Their League (BBC1, 9pm)

WE continue with the adventures of five of Manchester United's most successful players after they decided to buy struggling Salford City. In the concluding part of this documentary, it's February and new managers Bernard Morley and Anthony "Jonno" Johnson have arrived with a fearsome reputation. Darlington are now in the top spot of the league, so everyone is dedicated to winning the last games and landing that much sought after promotion. However, the star striker's day job and a well-intended thank you dinner have disastrous repercussions for the club.