The main weed that causes me trouble is creeping oxalis, it looks a bit like clover. It's a noxious pest here, nearly impossible to eradicate without a scorched earth policy. Lucky it's seasonal, so it will all die in a couple of months.
Sure thing!
The design was very approximately based on the LGB track cleaning loco, with a few (actually a lot) of concessions to make use of available materials. I'm lazy too, but also poor and cheap so sometimes home made is the only option. It fits with the theme of a perpetually impoverished and run down tramway anyway.
Just to show there is some sort of weed control on the tramway, here is the environmental contractors engaged in their duties.