A 46-year-old man was struck and killed by an inbound commuter train in Attleboro just after 9 a.m. Thursday, MBTA spokesman Joe Pesaturo said. The unidentified victim was hit while walking on the tracks east of the Attleboro train station, near Peck Street, Pesaturo said. No passengers on the train were injured, Pesaturo said. The station is on the Providence/Stoughton Line. The incident caused residual delays. Transit Police were investigating, and no further information was immediately available.