The 503 operates from Essendon Station along Albion St to East Brunswick tram terminus via Anstey station.
The 503 was operated by Essendon-Brunswick Bus Lines and now by Moonee Valley Bus Lines.
1st February 1986 Timetable - A4 page
Weekdays
First services: 6.10am from Essendon to East Brunswick, 6.30am from East Brunswick to Essendon.
AM peak frequency: Every 15-20 minutes until around 8am.
Interpeak frequency: Every 25 minutes.
PM peak frequency: Every 15-20 minutes until 7pm.
Last services: 6.40pm from Essendon to East Brunswick, 7pm from East Brunswick to Essendon.
Saturday
First services: 6.40am from Essendon to East Brunswick, 7am from East Brunswick to Essendon.
Morning frequency: Every 25 minutes.
Afternoon frequency: Every 40 minutes albeit with departures at 1.15pm, 2.15pm, 3.05pm and 3.55pm from Essendon and departures at 1.40pm, 2.40pm, 3.30pm and 4.15pm from East Brunswick.
Last services: 6.35pm from Essendon to East Brunswick, 6.55pm from East Brunswick to Essendon.