The meaning it represents is to miss some opportunities in life, a new life.
In the first case, when you arrive at the train station, you stand at a turning point in your life.
Time has passed and the train has left, which reflects that opportunities are not harmonious with your life.
The second one is missed because of the thread.
Behavior symbolizes the responsibility, burden and security in your life.
You missed the train for these reasons, which means that you can't let go in your life and pay attention to too many details.
When you face some good opportunities or changes, you always miss them for various reasons.
Maybe it's work, school, feelings and so on.
That's what dreams mean.