Dreams about traveling, especially by train, often symbolize a journey in life or a specific path you're taking. The realization of your friend's death during the dream could represent feelings of loss or grief, or it might symbolize the end of a relationship or a significant change in your life.

This dream may reflect your subconscious processing of emotions related to your friend, whether you are currently dealing with loss or simply thinking about your friendship and the impact she had on your life. It could also indicate feelings of regret about not having connected with her recently or unresolved feelings you have regarding your relationship.

Consider how you felt during the dream and upon waking. Were you anxious, sad, or indifferent? Your emotional response can provide further insight into what this dream means for you personally. It might be beneficial to reflect on your relationship with your friend and how her absence affects you. If you feel comfortable, you could also consider reaching out to others who knew her, as discussing shared memories can sometimes help in processing grief.