Carts Blanched

Picking up on my series from..er... years ago, I couldn't go past these abandoned shopping trolleys without a quick snap. Standing (and lying) on the side of the bike path at Toombul,  they look like they've been fished out of Kedron Brook which runs nearby. It makes me wonder who took the trouble to fish them out and why they left them there.
Apologies for bad title pun.