The investigation is ongoing and no cause has been determined, NTSB said.
The Jan. 31 incident occurred at 12:40 p.m. local time and involved a Union Pacific (UP) employee with 41 years of rail service who was struck by a piece of rail-bound maintenance equipment known as a track maintenance tamper (TMT). The TMT was tamping wood crossties on a main track near Vail.
The employee was airlifted to a hospital, where he later died from his injuries, NTSB said.
More details of the incident are available here.
“Future investigative activity will focus on UP operating rules and the mechanical condition of the TMT. The investigation will also examine on-track safety procedures when employees are working at or near moving maintenance machines,” NTSB said.