Iron fossils the nick name given to the antique steam powered locomotives maintained preserved, and operated by the locomotive historical society. When the old No. 3 engine is having mechanical problems it falls on to Mickey, Violet, Britney, Roxy, Tesla, and Molly a group of train conductors to help bring the old train in for repairs, but they need to take it through a route that leads through an old haunted forest and none of their male counter parts are brave enough to make the journey. Unfortunately for these brave girls the forest isn't haunted but inhabited with prehistoric beasts and when their train breaks down just outside the forest they will have deal with fossils of flesh instead of iron, but with how hard these horny dinosaurs are they may not be able to tell the difference.