Dark Train

Dark Trains are enemies found in Spirit Tracks.

Characteristics
Dark Trains were originally normal trains, but they became possesed, turning them into bomb-shaped trains that intend to crash into Link's train, and explode on contact. However, as intimidating as they may seem, Dark Trains can either be evaded, or temporarily halted by through the use of the cannon attached to the train, but they cannot be outrun, as they are a bit faster than the Spirit Train. Worse yet, they are an instant kill to the Spirit Train if they collide. Fortunately, they operate on a strictly defined path, and can easily be avoided if the operator knows that path.

Once Link enters the underwater tracks of the Ocean Realm, Dark Trains that resemble a torpedo begin to appear on the map. These type of trains are called Armored Trains, and they pursue Link with greater tenacity than the Dark Trains do. They are slower than other trains, but they can turn 180 degrees on the tracks.

Upon entering the Dark Realm, the last area in Spirit Tracks, Link will need to use the Spirit Train to destroy six Armored Trains with help from the Tears of Light. Tears of Light will increase the speed of the Spirit Train and surround it in an invincible force-field strong enough to destroy Armored Trains.

Trivia

 * When two Dark Trains are on a collision course, they'll both stop short of colliding and then turn around. They do this by rotating on their bases. They can also do this to stand guard; if Link is a threat to the Fire realm, they will chase him, but then turn back by rotating once he is a certain distance away.
 * Dark Trains destroy anything they come in contact with, including enemies like Bullbos, Tanks, and lava rocks. Unlike colliding with the Spirit Train, they will not explode when hitting anything else.