It's actually a fairly short Complaint at only 7 pages. Here are the specific allegations regarding the fire (sorry about the weird formatting--I cut and past from a PDF file):
The 416 Fire began on June 1, 2018, at approximately 9:53 a.m., when one of Defendants’ coal-fired steam trains, bound from Durango to Silverton, was passing through the San Juan National Forest lands at a location called Shalona Hill, which is adjacent to a private residential subdivision called Irongate Way.
Evidence indicates that the coal-fired steam locomotive cast off one or more burning cinders or other hot material, and ignited a small brush fire next to Defendant’s railroad track on National Forest land.
Fire investigators located the origin of the fire as next to the railroad track.
Federal fire investigators found a collection of numerous, extinguished embers, cinders and ash particles on the ground adjacent to the railroad track, including at the specific point of fire origin.
Multiple eyewitness statements verify that the fire ignited adjacent to the track immediately after one of Defendants’ coal-fire steam locomotives passed the origin point.
The Forest Service and other agencies promptly mobilized fire suppression efforts on the day the 416 Fire ignited.
The fire spread across the San Juan National Forest, and ultimately burned over 53,000 acres of National Forest land.
Firefighters did not declare the 416 Fire extinguished until November 29, 2018.
