Historian uncovers evidence of second mass grave of Irish immigrant railroaders in Pennsylvania who suffered from cholera, violence and xenophobia

Caskets of Irish railroaders whose remains were excavated from a mass grave outside Philadelphia. AP Photo/Matt Rourke

When commuters on the R5 SEPTA train that connects suburban Chester County to Philadelphia approach Malvern station, they might spot a square stone monument on the right side in a clearing surrounded by a thick stand of forest.

Above it, a sign paid for by the Amtrak electrical workers union and suspended from the trees reads: