in reply to nangadef: (1) according to the news report I saw, she let go of the pram to "pull her trousers up". She did appear to be adjusting them. (2) Could be wrong but it looked a windy day. (3) It's possible she reacted so slowly due to shock? If that film is on the next news broadcast I see, I won't be watching it again.
One thing that really annoys me, is to see a mum walking along totally engrossed with a mobile phone against her ear, and a young child or children are dawdling along yards behind, usually beside a busy road. One day, that mum will be blaming a driver or abductor for some tragedy perhaps.
It looks like she saw the train pulling in and turned the buggy ready to board. The edge of the platform has been reworked judging by the ragged join in the tarmac and may have been sloped to allow rainwater run off or it may have been a gust of wind. Whatever the reason, it has a happy and very fortunate ending.