Dream about being trapped on a train is an indication for doubt in the choices that you are making. You may be trying to fulfill some emotional need. You may be reshaping your thinking or ambitions and eliminating unwanted thoughts/habits. This is unfortunately a warning signal for a lack of self-esteem. You need to take things slow.
Being trapped on a train dream is unfortunately an issue that you are moving over and not confronting head on. You feel the need defend or protect yourself from verbal attacks or emotional abuse. You are not letting your past issues or current problems stop you from going after your desires. It is a premonition for your inability to confront some subconscious issues or feelings. You are unyielding in your thinking and beliefs, which may hinder you in the pursuit of your goals.
If you dreamt about being trapped on a train:
Your feelings may be on a hair trigger, which could inflame a situation that is not actually anything too much to worry about. If you and your sweetheart want to be on good terms, stop and think before you speak.