UPDATE, 6:40 p.m.: Transit Police gave Keolis the OK to resume normal operations through the area. Transit Police report the boy was airlifted to a Boston hospital; is expected to survive.
The 4:20 train to Franklin hit a 14-year-old near Islington station in Westwood.
Gugliemo reports getting a text from somebody on the train:
Police informed passengers. Have to get off and board another.