It's only scanning the train to base radio network so it'll be quite most of the time. V/Line is moving to ICE radios so locos with ICE radios won't be heard on this scanner. Where are you located for this to receive all of the TTB radios? Somewhere in Melbourne I assume? Just saw it said Kensington on the other page. If you programmed channel 1's frequency into the radio you'd get a fair amount of traffic on it. From conductor's to drivers, drivers to signal boxes and Centrol (West tower for the RRL), METROL to non suburban trains etc.
Can you please confirm the frequencies for channel 1?