Characters in the Play "Mind the Gap"

When reading the play “Mind the Gap”, the first question what is meant by this title. As an underline note says, such announcement is used in the stations as a reminder to be attentive at the edge of a railway platform. In the present case, it reflects the theme, which is the often appearing gap between generations as well as between different social classes, but the setting – railway – may symbolize the movement among these different areas. …