The building on the platform is the visitors' centre, which is entered from the opposite side. There are normally a couple of coaches sitting at the platform, but they had been used for tourist rides over the Easter weekend and had not yet been returned to their usual resting place.
There were several locomotives and coaches sitting in a long shed opposite the platform, including "4403", a preserved NSW 44 class locomotive:
Here's my driver at the controls:
Here's a short video I made:
Before leaving 4403 I took this photo of the engine.
It was actually very dark in there, and I could see almost nothing when I took the photo. I just pointed the camera and released the shutter.
Back on the ground again, I continued my tour. Sitting at the end of the shed, in a spot that made photographing it quite difficult, was Beyer-Garratt 6029 (billed as "the largest operating locomotive in the southern hemisphere.")
A little further down in the yard I found a couple of old steam engines. These photos are of 3016 (NSW C30T class), which has been beautifully restored to working condition:
There is more information about engine 3016 here.
This is engine 1210, a NSW Z12 class loco, which is being restored. It pulled the first train to arrive at Canberra:
More information on 1210 is available here.
Not far from the steam engines was a pair of (former VR) S class locos. The rear-most unit is S300 which entered service in 1957, and it's still struttin' its stuff. S311 entered service in 1960.