under construction being converted before release to traffic. Many of these W5-class trams were allocated to Essendon and (the new) Brunswick depots as a result of the mid-1930s conversion of the Elizabeth Street cable trams to electric traction. Most cars numbered above 800 had "swept corner" windscreens. From the early 1970s, many cars had their little-used, narrow centre doorways panelled-over, and most had their original windshields replaced with SW6-class types, which had "swept corners" with half-drop side windows, but not all of them received the deeper fascia. During construction in 1939, the last ten W5-class trams were modified with sliding doors, like as the first of the SW6-class trams which was being built at the same time. They also had metal-framed, full-drop saloon windows with quarter lights. In 1956, W5-class trams 785 and 787 were converted to SW5-class (type 2), following accident damage. Parts from the cancelled order for more W7-class trams were used in the repairs, and the two cars featured half-drop saloon windows, with quarter lights. An additional 83 W5-class trams were converted to SW5-class (type 3) trams between 1983 and 1986. They were fitted with aluminium sliding doors, but retained their original wooden-framed, full-drop windows. Apart from those severely damaged in accidents, the first W5 was withdrawn in 1987, and the last in 1994. During the mass withdrawal of W-class trams in 1994–96, the majority of SW5-class trams were retired in preference to the higher numbered trams, ostensibly due to the discovery of asbestos in the controllers. As of January 2020, there were no SW5 or W5 trams remaining in service, with the majority stored. However, nine W5 and three SW5 trams are preserved with heritage tramways in Australia and New Zealand, including a fully restored W5, number 774, on display at Hawthorn Depot. Fleet numbers CW5 converted to W5: 681 – 685 Built as W5: 720 – 839 Built as SW5: 840 – 849 W5 converted to SW5: 681 – 682, 721 – 734, 736 – 750, 752 – 755, 757 – 760, 764 – 765, 767 – 770, 773, 775 – 777, 780 – 781, 784 – 791, 793, 796 – 797, 800, 802, 805 – 812, 814 – 816, 818 – 819, 824, 828 – 830, 834, 836 – 838 W6/SW6 The SW6-class were introduced in 1939 and were followed by the W6-class which were produced between 1951 and 1955, 150 were built in