CHICAGO — A CTA employee was taken into custody after police said he shot a man at the CTA Red Line station at 95th Street.

Police said two men were at the train station at 15 W. 95t St. around 2 a.m. Saturday when they got into an argument and physical altercation.

One of the men walked away and tried to go down a set of stairs. Police said that’s when the employee shot him three times — on the lower abdomen, back and leg.

The man was taken to the University of Chicago Medical Center in critical condition.

Police arrived shortly after the shooting and placed the man into custody.

CTA said the employee was working as a customer assistant and was in violation of several CTA workforce rules — including one that prohibits the possession of a firearm. CTA said they are pursuing termination.

“The behavior of this one employee is not at all reflective of the thousands of hardworking, dedicated men and women who take pride in their work and responsibly perform their duties each day,” CTA said in a statement.

Red Line trains were shut down from 87th Street to 95th/Dan Ryan as police investigated.