Train 
A dream about a moving train signifies the current journey you are on. If you feel scared or have motion sickness while in the train, it indicates that you are sorry about something, and that you have some obstacles you need to overcome soon.
To see yourself on top of a stationary train car, it means that you will make a journey with an unpleasant companion, with whom you will end up over spending and waste excessively thus hurting you financially.
If you see railroads without a train in your dream, it means that you will gain direction and happiness in an endeavor you have recently decided upon.
On the other hand, to be on a train moving smoothly along without a track, it indicates that you will be worried over an affair which could eventually benefit you later for a better life.
Seeing a freight train in your dream, it is an omen of changes which will lead to your elevation.
Airbag
Dreaming about an air bag symbolizes the presence of protection and safety at the moment in your waking life.
Alternatively, if you dream about seeing the airbag deploy in a vehicle, it is a sign of warning that you're about to get hit with a major setback if you continue the current pace in your life.
Accident
To dream of being in an accident can be a warning for you to avoid whichever situation was involved in your dream, regardless of what it is. Lives have been saved by heeding this advice. If your dream involves a car, you may want to walk whenever possible and use extra caution when surrounded by traffic. If your dream involved an airplane, take a different flight for at least two days after your dream. If you're not planning on traveling by sea, yet your dream involved a boat or sea accident, this could mean love affair problems. Business venture reversals could be signaled if your dream had to do with ancient or outdated modes of travel.
Concussion
To dream that you have a concussion implies that you are wasting your natural skills and talents. You should take some initiative instead of expecting things to occur on their own.
Rear Ended
To dream of getting rear ended represents a problem from your past coming forward to cause new issues.
To be rear ended in a dream may also symbolize someone breaking your trust, such as an unexpected stab in the back.
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