Interesting. So, how common is the problem of harassment of women on trains that Jeremy Corbyn, the leading contender for the Labour leadership, considers women-only carriages a sensible preventative measure? From the article:
Accepting that sex related crimes are concentrated on females, the probability of a female being subject to a sex related incident on the tube or surface train does not exceed 0.4 per million journeys.
Supposing a woman makes 400 such journeys per year for a working lifetime of 40 years, the probability of her being involved in a sex related incident, at any time in her life, is about 0.007.