If you regularly use the subway, you may need to look at the other parts of the dream more carefully.
If the subway is not a regular part of your daily routine but is the primary dream image then you can consider it to be symbolic of the way that you navigate through your own emotions and hidden parts of self.
The subway is under the ground and represents the unconscious parts of self. All of us interact on conscious and unconscious levels. We have intuitive feelings and unspoken understanding that direct our lives as much as the obvious and fully conscious things. Consider the subway ride in your dream and try to understand what it is conveying to you about your more subtle navigation through ongoing life experiences.
The idea that is being represented the most by this image in a dream has to do with being just under the surface of your consciousness. Such a dream indicates that you can learn something by doing a little investigation of what is lurking below and find yourself in some new territory as a result. [2]
A subway may also indicate a preoccupation with getting to work and may reflect concerns in making a deadline. [3]
See also: Goddess Persephone, Integration Dreams. [4]
If you have this dream, you may reach a goal in real life by using the spiritual or instinctive part of your nature. [5]
Don’t get discouraged; they will soon be a faded memory. [6]
If boarding a train, you’re getting ready for a new direction.
If changing trains, you’re changing directions. [7]