Sorry but I think you are getting confused with the old sale yards. The sale yards are now out of town past the airport beside the waste reclamation depot and the pound about 6km out and while geography places it between the Bendigo and Toolamba signs it isn't really close to either.
The only operational meatworks I am aware of is on the edge of town on the Eastern Edge of Echuca East (yes the town of Echuca has areas/suburbs) which is the one currently in the news for all the wrong reasons. There was another one in Echuca South behind the showgrounds but I think that has shutdown.
So none of them are near railway lines or stations and while freight trains pass through Echuca to Deniliquin and occasionally rambles out the line to Moulamein (depending on the season and what is out there to bring in) it isn't possible to load freight in Echuca as no train will pick it up.
Also there are no facilities to load anything. What was the goods shed is now used for stabling velocities against the goods platform, The silos have not seen any traffic that I have seen since we brought up here in 2009. apparently the floor inside the good shed needs replacing and there are no container handling facilities so there is no way to load anything.
Other than container trains the only freight movements I have seen is wagons being moved to Bendigo/Geelong to be scrapped. All the ones in Echuca Yard are gone and about 3 months ago another train of similar makeup was seen crossing the Murray heading south from places unknown.
If Echuca wasn't a crew change point the freight trains wouldn't stop at here at all just as they don't stop at Kyabram or Rochester. Local businesses may want to send their products by rail but the railway companies don't want to invest the time and money into encouraging it.