It implies having an inner “engineer” and “conductor.” It can signify being directed by your inner being to a specific-life goal or destination, riding at times alone, being both engineer, conductor and passenger. At times others come along and travel and work with you – in life and in your dreams.
It can indicate having laid a path, using a “map,” and then laying a road-bed with “tracks of steel” to your destination – when the dream train is a traditional track-wheeled train.
The train can be a powerful symbol of a dream experience called mutual dreaming, in which two or more are traveling the subtle worlds together. The train implies safe traveling as the means and way is “engineered” by the individual’s soul-being or the collective “soul agreement” of the riders. When one follows (or rides) the “soul train” one is nurtured (trains do have diners) and assisted along the way, as the travel is in agreement with the soul’s destination and life purpose.
Of course, in the vast world of the mind and imagination, there are sky trains, space trains, and trains that burrow and tunnel through the earth – all signifying different potentials and movements that can be experienced in dreaming..