From the file's introduction
Shadow creatures adapt to life in a modern city with remarkable speed, particularly when they don't have any scruples about how they make their livings. In this brief adventure, a few such creatures move into a mundane subway station and quickly turn it into a nasty little dungeon.
The 7:48 from Central Avenue is an adventure set in the modern day, but it includes fantastic creatures and magic.
A Short Urban Arcana Adventure for Four 8th-Level Characters.