Dreams about traveling, particularly by train, often symbolize a journey through life or transitions you're experiencing. In your case, the train journey represents your emotional state and the connection to your friend. Discovering during the dream that your friend has passed away might reflect unresolved feelings, grief, or a sense of loss that you still carry.

Your emotional reaction in the dream—feeling shattered—suggests that you may still be processing your feelings about her death. This dream could be a way for your subconscious to remind you of your grief and the importance of addressing it. It's also possible that you miss the connection and the times you shared together, which could be manifesting in this dream.

Upon waking, your attempt to contact her is a natural response to wanting to reconnect with someone who has had a significant impact on your life. This indicates that you may need to find a way to honor her memory or express your feelings about her passing.

Consider reflecting on what your friend meant to you and how you can keep her memory alive in your life. You might also find it beneficial to talk about your feelings with someone you trust or write about your memories of her. This could help you process your grief and find closure.