A Metro train operator is no longer with the transit agency after officials discovered the operator was using the train in automatic mode, against WMATA rules.

A spokesperson says the operator, whose name is not being released, admitted fault, saying he “was curious to see if ATO (Automatic Train Operation) would work.”

The incident happened on March 17. Metro officials discovered the automatic mode after the train overran the station platform at Innovation Center on the Silver Line. They say the operator put his train into automatic mode several times that day.

Video from the cab shows the operator also eating a meal while operating the train, which is against Metrorail rules.

The Washington Metrorail Safety Commission noted the incident at its Tuesday meeting. They’re still investigating the cause of the station overrun.

“In ATO, Train Operators must remain alert, focused, and engaged, as small details, such as a console light illuminating or not illuminating as expected, can indicate that operator intervention is required,” CEO David Mayer said during the meeting.

Metro says they’ve conducted an investigation and found no evidence that operating in automatic was a systematic problem. WMATA would not comment beyond its statement because of personnel matters.

WMATA is aiming to bring back ATO in the coming months, but it first must undergo rigorous non-passenger service testing, and gain approval from the Washington Metrorail Safety Commission.

Metro was originally designed to run in automatic mode, using a combination of in-track sensors and computers to navigate the trains smoothly between stations. It was turned off in 2009 after the Fort Totten crash that killed nine people. While ATO was not at fault in that incident, the system was disabled while officials sorted out the issue. Metro has operated in manual mode since, despite several attempts to bring it back ATO in recent years.