This should list what Melbourne depots operate a given tram route.
Brunswick depot:
Routes 1, 6, 19
Camberwell depot:
Routes 70, 75
Essendon depot:
Routes 57, 58, 59, 82
Glenhuntly depot:
Routes 3, 3a, 64, 67
Kew depot:
Routes 48, 78, 109
Malvern depot:
Routes 5, 6, 16, 58, 72
Preston depot:
Routes 11, 86
Southbank depot:
Routes 12, 30, 35, 96