Update, 8:50 p.m. He was spotted on a trolley at Kenmore Square by an inspector, didn't want to get off, but is now with a Transit Police officer.

Jeffrey Cooper, an East Boston teen with a love of trains, disappeared yesterday afternoon and is still missing this morning, despite wearing a LoJack bracelet designed to alert police to his presence.

LoJack tweeted at 9:30:

He is wearing a LoJack SafetyNet tracking bracelet and we are doing our best to find him.

Cooper is black, 6'1" and about 160 lbs. Transit Police report he was wearing a green Red Sox baseball cap, a red and gray jacket, blue jeans, a black backpack, a blue Superman watch on his left wrist and gray high top sneakers.

Transit Police have posted two recent photos of Cooper.