Monster Moves (five)

The House Of Obsessive

Compulsives (C4)

BIG Boy was on the wrong side of the tracks. And that was a Big Problem because the world's largest steam locomotive was supposed to be making tracks to his new home across town.

This massive train and The Centennial, the largest diesel locomotive ever built, had to travel two miles down city streets to a new hilltop home in Omaha, the home of American railways.

So the very watchable Monster Moves had another Big Job on its hands turning these "kings of the rail into kings of the road".

Father and son team David and Bill Scribner replaced the locos' steel wheels with road tyres - 144 of them - for the journey. "I've never changed a tyre on a train before," joked Dave.

It didn't all go according to plan (for which the film-makers breathed a sigh of relief as a documentary like this is no good without a crisis or two). One loco got stuck crossing the rails, causing a train jam stretching back hundreds of miles.

Another father and son duo, Rick and Ricky Little, moved an historic railway station to a safe haven. Again, size was a problem. Their solution was ingenious, slicing the building in two with a small powersaw, just like slicing a loaf of bread.

Like the locos, the 1881 station made it safely to its new location. The occupants of The House Of Obsessive Compulsives were going places too - back home for the weekend.

Wendy, Sophie and Gerry were living together under the same roof at the instigation of Professor Paul Salkovskis as a form of intensive treatment. He felt if they helped each other confront their obsessions 24 hours a day, they'd benefit.

Wendy couldn't touch anything for fear of dirt and contamination. This "horrible, cruel thing" meant she hadn't been able to touch her husband or sons for three years. Sophie spent up to seven hours a day cleaning herself, ruling out her dream of having a baby. Ex-teacher Gerry avoided pens and pencils for fear of making a written confession to a crime he hadn't committed.

Telling them "don't be so silly" wasn't an option. Their hang-ups may seem irrational but were terrifying real to them. The decision to send them home was a risky strategy. You also felt that, for their partners, the strain of living with an OCD sufferer must be great too, but there was no therapy for them. Just the possibility, in the case of Wendy's husband, of a cuddle and even sharing the same bed for the first time in years.

Presumably being followed around by a film crew was part of the therapy. By the end of the series, it seemed to be working. The professor is now attempting to get finance to put other OCD sufferers into his House of Obsessive Compulsives. And this two-part TV series serves a pretty good advertisement.