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Federal suit alleges AI system injured Union Pacific employee

Engineer says AI system caused lead, middle locomotives to move at conflicting speeds

A Wyoming locomotive engineer is suing Union Pacific in federal court, alleging he was injured when an AI computer software system caused two locomotives on the train on which he was working to move at conflicting speeds. (Photo: Jim Allen/FreightWaves)

This story has been updated to include a comment from Union Pacific.

A Wyoming locomotive engineer is suing Union Pacific (NYSE: UNP) in federal court, alleging he was injured when an AI computer software system caused two locomotives on the train on which he was working to move at conflicting speeds. 

Andrew Kirol was injured in May 2021 when the software gave “incorrect, inconsistent, contradictory and dangerous instructions” to the locomotives powering the train, according to a lawsuit filed April 18 in the District of Wyoming. 

Kirol was required to use the software, known as the Leader system. The system’s purpose was to learn how to control locomotives on trains “without input from the Locomotive Engineer,” says the lawsuit, which seeks unspecified damages.


“LEADER is not AI — it is a nearly 15-year-old technology that is part of Union Pacific’s Energy Management System and is similar to cruise control on a car,” according to a statement from Union Pacific. “LEADER does not ‘learn’ and make decisions that apply across other locomotives, and the engineer can take control at any time. It uses the topography of land, as well as train length and weight to optimally apply power and speed to the train, saving fuel and decreasing Union Pacific’s carbon footprint.”

Union Pacific calls the system an “energy management system” that “automatically [controls] a locomotive’s throttle and dynamic brake to reduce fuel usage, minimize GHG emissions and optimize train handling.”

The train was hauling freight near Green River, Wyoming, through an area of hills and valleys. Kirol was in the lead locomotive. A middle locomotive was typically controlled remotely by the engineer, but all locomotives were controlled by AI on the day of the incident, according to the suit.

As the train climbed a hill, the system slowed the lead locomotive while at the same time causing the middle locomotive to speed up. This “resulted in the middle locomotive violently pushing the cars between it and the lead locomotive towards the head of the train and into the locomotive where the Plaintiff was situated,” the suit states. “This caused a ‘rear ending’ of the Plaintiff’s locomotive with significant speed and force” by compressing the slack spaces between cars.


The conflicting speeds between the locomotives were “a circumstance which no competent Locomotive Engineer would have allowed to arise under the circumstances,” the suit alleges. Kirol was “violently” tossed around the cab, injuring his lower back.

The lawsuit alleges that Union Pacific didn’t warn Kirol of the possible hazards, didn’t train him adequately on operating the Leader system and failed to inspect the locomotives.

Kirol, who was “a strong and able-bodied man” prior to his injuries, expects to have physical impairments in the future and physical pain “probably permanently,” the lawsuit says.

Brinley Hineman

Brinley Hineman covers general assignment news. She previously worked for the USA TODAY Network, Newsday and The Messenger. She is a graduate of Middle Tennessee State University and is from West Virginia. She lives in Brooklyn with her poodle Franklin.