The Mark III Monorail was the monorail train model used on the Disneyland Monorail System from 1969 to 1988, replacing the Mark II trains. The Mark III trains began to be phased out in 1987, before being rebuilt into the Mark V Monorail trains, replacing everything except the chassis. They were designed by WED Enterprises and were the last of the "bubble-top" style trains to be used. These were also the first trains to consist of five cars. One of the trains was sent to be used on Rocket Rods while the other four were used for the Mark V Monorail.