The 7.39, episode 2, BBC One, review We could see in the first episode of The 7.39 (BBC One) that no good would come of it, that there would be tears before bedtime - and after. "How does this end happily," Sally (Sheridan Smith) asked Carl (David Morrissey) mid affair, without hope. The coupling that had started on the commuter train then hit the buffers, after Carl's wife found out. Waterloo was their Waterloo. The crisis was sharpened by his getting the heave-ho from work just as she began to heave into the wastepaper bin one morning - first signs of the baby that her dim fiancé Ryan (Sean Maguire) wanted for his "beautiful hostage" as he jokingly called her, with characteristic lack of self-awareness. Actually, neither of the men characters was a patch on the women. Sheridan Smith was well up to the fetching wittiness of her character; Olivia Colman utterly convincing as Maggie, the angry wife with no illusions. If this had been written by Shakespeare instead of David Nicholls, Carl would have been killed by Ryan when he found out, instead of sent to casualty. Then the two women would have met at his grave instead of in the hospital waiting room. "I don't think we're bad people," Sally told Maggie. "Bad people never do," Maggie replied. Morrissey's middle-aged man in love remained locked in unreality as long as he could. He even took his lover, pregnant by the loyal Ryan, away to a seaside bungalow in an impossibly picturesque location by the White Cliffs. Ryan's comically ill-judged speech "forgiving" Sally convinced her that she could not go through with the wedding. So it was a happy ending of a sort after all. That suited me, as I was longing for confused Carl to get back together with marvellous Maggie. "Stuck in a rut?" she had said to him. Me too! But I have a family that I love, and I would not betray them. Considering how many people commit adultery - most of us, it seems, looking around - it is odd how seldom drama convincingly portrays its badness, the harm it does. Two hours is a generous amount of screen-time to devote to the exercise and I wouldn't have chosen to watch unprompted. I'm glad I did. But on a trainspotting note, didn't we see Ryan and Sally in Canterbury? The trains from there don't go to the main station at Waterloo.