From Graeme Cleak’s route history notes until 1990:
ROUTE 504 MOONEE PONDS – CLIFTON HILL via Brunswick Rd
Route 30 Moonee Ponds- East Brunswick (Lygon Street) commenced in January 1933. It extended to Clifton Hill at the start of 1947 and by July 1948 the operator was Neesons Bus Service. Renumbered 504 in 1971.
Sold to F. Bono 5/8/1974, then to Maison, Balzana & Paparone on 23/12/1975. Northern Bus Lines (Pulitano) took over 13/8/1979.