Also you have the Collie Tourist information centre on the main entrance to Collie with Loco's on display along with the Goods shed display in the centre of town, if your into timber wagon restoration these guys are tops. Then at the Esperance goods shed you have W919 and other railway relics. At Claremont Station in Metro Perth you have the Signals Preservation group. The Kalamunda Station Museum at Kalamunda. So yes there is a whole host of things to see railway wise
If you are visiting Geraldton then you have the Northampton Railway Museum along with the Walkaway Museum at Walkaway.
Should you get to Kalgoorlie there is the Boulder Loopline group currently going thru refurbishing.
So there ya go plan it out and im sure you will see it all