As a train driver myself, I could hardly believe that someone was making a film they call a "comic caper" about suicides on the railway. Of all the subjects they could have chosen for a comedy, this must rate rock bottom.

On the website of Three and Out, the producers ask "Should comedy be allowed to address any subject?" I suppose it depends how it's done: if it did anything to show how distressing it can be for a driver to discover a body under the wheels of his or her train, I'd welcome it. But just to raise cheap laughs?

And it's not just the families of these tragic people that concerns me. I've seen how an incident like this can affect a train driver. Last year 249 drivers had to get out of their cab to see that their train had been used to end a life. For all of them it is a traumatic experience. Some never drive trains again. Every one of them remembers the incident throughout their working life.

Many drivers won't talk about it - they just try to set it aside and not remember. Others talk about it a lot, turning the incident over in their mind and needing to re-visit it again and again. Others try to cope by pretending it hasn't affected them at all. But the fact is that no train driver I know is so callous as to be unmoved.

I can't believe that London Underground let the film-makers use their facilities to make this offensive farce. What were they thinking of? On the Piccadilly Line there are posters in the tube right next to the driving cab. How sensitive is that? You pull up at a station to be reminded of your worst working nightmare knowing that someone thinks it's a good subject for a chuckle and that your management have collaborated in it.

I think that every possible aid and assistance should be given to drivers who are unfortunate enough to endure this experience. To do this means that every manager should be aware of the variety of options that are available. It doesn't actually inspire us with confidence when London Underground was willing to provide facilities and locations to make the film.

I also saw one of the film-makers saying that drivers should see the film before complaining about it. This misses the point. I don't want to assess it for style, casting or script. I just object to having my job - and my colleagues - misrepresented in this way just so someone can turn a fast buck.

I'm sorry that anyone had such a taste-bypass as to make this film in the first place. Personally I'd choke on my popcorn if I had to watch it. I just hope that the people who have so little to do that they turn up to see it remember that for train drivers everywhere railway deaths are a tragedy, not a comedy.