A recurring element in Oral Tradition and fiction is a sinister or at least mysterious phantom train beholden to no earthly schedule. Often this Train is in charge of transporting souls to the afterlife. This could be a vehicular version of The Grim Reaper, minus the reaping, watch out this train might run over people.
The belife came in to stories by a poular saying of Railroad folklore says you should never mimic the sounds of a train whilst on the railway tracks, especially at night, lest you summon said Soul Train.
In some stores this train is vibrating the world in pieces as it goes and the supstances that powers it has potential to make blob monsters
They say that it, "used to run both ways, but these days it's a one-way ride".
The Train is often driven by a conductor (Who is the Grim Reaper himself) and holding silent soul passengers who are creepily represented as semi-featureless shadows. They Look like this.
Lord Death: WHO WANTS TO RIDE MY TRAIN!!!??? Anyone? How about You Little Girl?