Before the Great War women did not do certain jobs.
Women did not have the vote.
There were very few Postwomen.Generally women did not work on buses or trams.Women did not work in engineering.There were no Policewomen or women in the Armed Forces.
As all available able bodied men were taken by the armed forces the government turned to women to fill the labour shortage. Jobs which in peace time did not admit women were now open to both sexes.
A handful of women were tram drivers but many more were tram or bus conductresses.