This from Dan McInerney:

I was downtown for the marathon, when a Still and Box alarm and EMS Plan 1 came in just after 1pm for the subway fire on the CTA Red line at 230 S. State St. E1 and AT1 went down to check and found nothing; the radio traffic indicated there was a malfunction with one of the el cars, but no smoke/fire. Due to the marathon taking place, there was a significant police response along with the usual compliment of fire apparatus. 
Chicago FD  Truck 1

Dan McInerney photo

Chicago FD  Truck 1

Dan McInerney photo

 Chicago FD Squad 1

Dan McInerney photo

Chicago FD  Engine 1

Dan McInerney photo