Boston-area transit riders endured multiple delays Tuesday on subway and commuter rail lines, sparked by mechanical failures, clingy leaves, and signal woes. During the evening commute, the Newbury/Rockport and Haverhill lines encountered 10- to 20-minute delays because of mechanical failures. The Needham line experienced delays of up to 45 minutes because of slippery rails, caused by leaves that fall and cling to the tracks. A disabled train on the Forest Hills-bound side of the Back Bay/South End Station was reported at 4:54 p.m., causing 10- to 15-minute delays.
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