Federal lawmakers are disappointed with the MBTA’s decision to keep speed restrictions on the Orange Line in place until December.

Posted speeds are back to the 12 former slow zones, but 10 speed restrictions remain. The T initially said all slow zones would be removed five to seven days after service resumes on the subway line in mid-September.

U.S. Sens. Ed Markey and Elizabeth Warren said, “It is disappointing that some speed restrictions on the Orange Line will remain in place more than two months after the end of the month-long shutdown. despite promises that the shutdown would provide faster service.” In a joint statement on Wednesday.

In a letter to both senators on Tuesday, MBTA General Manager Steve Poftak said the T has made “significant progress” in removing speed restrictions along the Orange Line, and removing most others in November and December. intends to

However, Poftak said riders should still expect slow zones “from time to time” on certain sections of the track due to ongoing maintenance needs.