A typical set would be 7 cars M-T-T-M-T-T-M, while there was also single Driving Trailers (M = Motor, T = Trailer)
Tait Train
Years in service: 1910* - 1984 (Steam hauled prior to suburban network electrification in 1919)
Power: 105 kW
Max Speed: 80 KM/h
3 car set

7 car set

Driving trailer

Bonus round! There were also four built "Parcel Vans" which were double-ended Tait Motors - mianly used for distributing mail, parcels and staff pay around the network!

More from wikipedia on Melbourne's Tait Trains.
https://en.wikipedia.org/wiki/Tait_(train)
https://www.youtube.com/watch?v=5vVhYUHZHgY