The trains were taking home members of the Catholic Total Abstinence Union of America from a 20,000 person rally in Hazleton, Pennsylvania. Altogether, 10,000 were returning to Luzerne and Lackawanna counties via the railroad. To accommodate this many passengers, eight trains were provided, running at ten-minute intervals. Each train had between 8 and 12 cars and was headed by two engines to cope with the steep grades between Penn Haven and Hazle Creek Junctions through what is now the Lehigh Gorge State Park. Lookouts were posted on each of the engines to watch ahead for signals. The first five trains passed through the Mud Run station area without incident. As the sixth train passed through, it stopped 600 or 700 feet beyond the station as there was no 'All Clear' signal displayed ahead. There was a red light on the rear car of this train, indicating its presence and serving as a stop signal for any approaching train. Unfortunately, the station was on a curve making it difficult to see the idled train. The flagman, James Hannigan, of the idled train walked back along the track to warn the seventh train, which was then approaching Mud Run. During an inquest conducted by Coroner A. J. Horn of Carbon County on the morning after the accident, Hannigan stated that he had gone 400 feet from the rear of the idled train and that "he did not know about a rule requiring that he go back a distance of sixteen telegraph poles as required by LVRR regulations." That distance was lengthened to 1,900 feet at his trial. The seventh train, headed westbound, had passed an eastbound train, which would normally indicate that the single track area of the line ahead was now clear. The lookouts on the seventh train failed to see the red signal at Mud Run station and by the time they noticed the light being waved frantically by the flagman of the sixth train, it was too late to avoid a collision.
Collision
The full length of the lead engine telescoped into the rear car and drove it two thirds of its length into the next car. Only two excursionists, John Curran of Pleasant Valley and James Jennings of Minooka, survived in the rear car 'on all sides hung mangled bodies and limbs' whilst the second was described as 'crowded with maimed and bleeding bodies'. An attempt was made to withdraw the engine from the third car but brought 'such awful cries of distress that it was abandoned'. In all 64 were killed and scores injured; 32 of the dead were from the small village of Pleasant Valley or Moosic and attended St. Mary's Roman Catholic Church, many were teenage members of the Drum and Bugle Corps of the St. Aloysius Society.
Charges
On Section 6, the idled and telescoped section, Conductor Charles Terry and Brakeman and Lookout James Hannigan were found guilty of gross negligence by the Coroner of Carbon County and his six jurymen. On Section 7, the leading engine, Conductor Joseph Keithline of Wilkes-Barre, Engineer Henry Cook of Wilkes Barre, Fireman and Lookout Hugh Gallagher, and Brakeman and Lookout Joseph Pohl were also found guilty of gross negligence. On Section 7, the second engine that controlled the brakes, Engineer Thomas Major of Mauch Chunk and Brakeman James Mulhearn were found guilty of gross negligence. One of the lookouts even admitted to having seen a red light but 'did not think the red light meant anything, as nobody used it'! In January 1889, the cases against Conductors Terry and Keithline and lookouts Mulhearn and Pohl were ignored. Cook and Hannigan were tried together and were acquitted. Major, who was tried separately, was also acquitted.
List of those killed
All names come from "Our Broken Ranks 1888/89 —Commemoration of the Catholic Total Abstinence Union" and The Mud Run Train Wreck - A Disaster in the Irish-American Community
