The CTA is halting trains on its Red, Yellow, and Purple lines on the North Side due to an unspecified issue with the tracks near the Howard terminal.

CTA Red, Yellow, and Purple Line trains were suspended Thursday evening after a derailment at the Red Line Howard stop in Rogers Park around 5:38 p.m.

The Chicago Transit Authority broke ground on Friday to extend the Red Line, after decades of promises to stretch the CTA's busiest rail line further south, and concerns that the federal government could cut off vital funding for the project.