Losing a mother on a train platform

In a dream last night I was sitting on a train with my mum and her friend. The train stops. My mother's friend is getting of at the station. My mother gets off as well, to say goodbye to her friend. The train starts moving again very quickly and my mother is stranded on the platform. All her stuff is in the train with me. The train driver shouts that she will be back in a few moments, but I see my mother running after the train. My mother is too old for the stress of  running. The train travels a long way through the green country. I switch my mobile phone on. After a few minutes I start to think about how to get a complaint form.