Another innovation during the 1970s was the application of all-over adverts on tramcars to increase earnings. Advertising on Blackpool tramcars first appeared on the Conduit cars in the early years of the tramway, with upper deck decency panels utilised for this purpose. Some trams such as the Blackpool and Fleetwood Racks and Boxes had side panels fitted to the roof for advertising purposes. Various trams have since had adverts applied on the cab-ends and sides upon their liveries. In 1965, Coronation tram No. 310 was fitted with illuminated advert panels at the cab ends on the roof. This was followed by larger rectangular boxes in the 1960s on various Coronations, English Electric Railcoaches, Brush Railcoaches and OMO trams and remained a feature on some of them until the mid 1990s. In 2010, Brush Railcoach tram No. 632 had new advertising boxes fitted to recreate this feature. All-over adverts first appeared in 1975. Balloon tram No. 707 was the first tram to carry an all-over advert for Empire Pools. Brush Railcoach tram No. 622 was the first single-deck tram to carry an all-over advert for Blackpool Zoo in 1975. The English Electric Railcoaches, Brush Railcoaches, OMO trams and Centenary trams which carried adverts had their towers panelled over to provide more space for advertising. Various all-over adverts have since appeared on several tramcars.