Speeding

In both cases, the vehicle in the dream is something that cannot be stopped - a speeding train, a car with no brakes. So I would guess that what's got you worried is something that you feel as if you cannot stop.

Speeding
Dreaming that you are speeding, demonstrates that you are feeling compelled and driven to complete something. You may be moving too fast in some relationship or situation.

Speeding
To dream that you are speeding, indicates that you are feeling compelled and driven to complete something. You may be moving too fast in some relationship or situation.

Speeding
To receive penalty points for speeding or other driving violation signifies that something you are doing is incurring karma.

Speeding Truck (Speeding Truck Dream)
In my dream, As I was walking down the side walk a delivery truck was speeding pass me into a very busy office building, as I turn around I could hear the screams, and horrible sounds (maybe bodies be...

ACCELERATOR speeding towards goal
ACCENT express yourself in a certain way
ACCEPTANCE self-esteem
ACCESS knowing everything about something
ACCIDENT delay in putting thoughts into practice
ACCIDENT major upsets to the the mind ...

To dream that the time on a clock is moving or speeding out of control, symbolizes some overwhelming task or emotion that you are going through in your waking life.
To dream that a clock is moving backwards, parallels the way that your life is going.

To dream that you are speeding, or traveling at a very fast speed, indicates that you are feeling compelled and driven to complete something. You may be moving too fast in some relationship or situation.
Speed Bumps ...

Of course, dreams about speeding through a test and knowing you're doing well, or performing superbly in an event, speak of a different level of confidence in the dreamer. These dreams may serve as rehearsal for an approaching performance.

Are they stopping you from doing something - yelling at you for speeding, scolding you for drinking? This means that you feel someone in your life (your parents? Your partner?) is trying to take control of what you do.

You may be trying to escape from some situation or some other responsibility in your waking life. A motorcycle is also symbolic of raw sexuality. Dreaming that you are speeding on a motorcycle indicates that you are moving too fast.

See also: Speed, Dream, Dreams, Will, May