BOSTON (WHDH) - Shuttle buses replaced trains along part of the Green Line for a couple hours on Monday due to a “pantograph problem,” the T said. 

The T first announced issues in a post on X near 2 p.m., warning of delays due to a disabled train at Copley station. 

By 3:15 p.m., the T said shuttle buses were replacing trains between Kenmore and Haymarket stations. The T also said maintenance personnel were on site dealing with the disabled train at Copley Monday afternoon.

At 4:39 p.m., the MBTA announced that regular service between the stops had resumed.

Earlier Monday afternoon, the T said B Branch was also suspended between Babcock St and Government Center. E Branch service was suspended between Heath Street and Government Center.

A pantograph is the metal arm that attaches a train to its overhead wire. Pantograph problems have snarled T service on previous occasions, including one incident in March where 180 riders needed to be assisted off a disabled Blue Line train.

“It is frustrating to see the same issue just being perpetuated and the root cause isn’t being fixed. All that time that we road shuttle buses, left for work an hour early to get there just barely on time, it’s just — why are we doing that if these issues still aren’t being fixed? The MBTA really needs to be better,” one T rider said on Monday.

While crews continued to work at Copley, crowds of people were seen waiting for buses or planning alternate means of transportation at Government Center station near 4 p.m.

This is a developing story; stay with 7NEWS on-air and online for the latest updates.

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