The info from ladder 46 and engine 17 came from http://www.code3firetrucks.com/co3bachilfi1.html The fisrt pic after the one with the black backround has ther flag.
About this creation
The most recognized engine from the movie would be Engine 17. Engine 17 started service with the Chicago Fire Department in July of 1970. This1970 Ward LaFrance Pumper was first assigned to Engine Co. 8. The pumper was later assigned to Engine 18. In 1987, it was refurbed with a Ranger cab and E-One body before it was given to Ron Howard's production group in July of 1990. Ron Howard used Engine 18 (portrayed as Engines 17 & 51 in the movie) until February of 1991. After the filming of the movie, the apparatus was given to Engine 69 were it remained in-service until 1995 when it was disposed of.