This one-shot, horror-themed adventure is set on the lightning rail of the world of Eberron! Will your party of 6th-level adventurers be able to rescue an innocent before it all comes crashing down!? Nightmare on the Mournland Express features: An example lightning rail to explore. Updated 5th edition rules for running all sorts of encounters on the lightning rail. A bestiary appendix containing 9 stat blocks, including dragonmarked NPCs and nightmarish monsters! Enough material to run an alternate scenario: a train heist!