Just a few recollections from the 30's and 40's . The Mont Park branch was really a siding with light rails and the light steel stanchions used in suburban sidings. It left the Hurstbridge line on the Melbourne side of Macleod station which was then one platform on the west side of the single line. The line ran BEHIND the platform with a walkway across it to get to the booking office and platform gate of the station. There was no platform at Mont Park, it was purely a goods yard. I can't recall whether it had two or three tracks, but visiting some one in Gresswell I remember seeing a few rail wagons there.
There were four hospitals in the complex as shown in that 1966 Melway map - Mont Park Hospital, Gresswell Sanitorium, Macleod Rehab Hospital and Laraundel Psychiatric Hosp over near Plenty road. So probably all may have used the goods yard at some time. Orienting the Melway 1 map with the current edition, I would say the the location of the goods yard would be very close to the circular pond on Red Gum Common Map 19 K5/6.
In those days the Heidelberg line was single from Alphington with a passing loop at Ivanhoe (2 platforms ) Heidelberg was an island platform, and off peak the trains from the city terminated there and passengers had to walk across to the opposite platform for the shuttle to Eltham which ran about once an hour and about every two hours to Hurstbridge. Rosanna and Macleod platforms were on the west side of the line, Watsonia on the east side. Greensborough had only one platform but it had a crossing loop, so the first train would enter the platform, unload and load, then back out down the track to clear the points then move forward into the loop. The other train would come straight into the platform collect the staff for its next section and go on its way. The staff it had brought in would be given to the driver of the first train who would go on his way some five minutes or more after having arrived. Just like they did in the country.
But Greensborough was all country in those days.
On interesting thing happened according to a press report late in WW2.
The Mont Park goods couldn't go past Macleod,as person or persons unknown had stolen all the copper junction wires that re brazed to the
rails at each joint for the electrical connections. Copper and the like was very scare due to wartime and it took quite a few days before the track could be reopened.