I've been using minecarts in every fortress since they've been released now (and I love them), and other than the very first powered spiral ramp setup I had, they've all been guided tracks.
But I am constantly hospitalizing dwarves, because even though the carts are guided, dwarves are getting crushed left and right. Usually it'll be fine most of the time, but every now and then I'll notice a combat report of the *iron minecart* strikes the worker in the right lower leg, shattering the bone! and off he goes to take up a hospital bed. This is rendering my dwarf rammer completely useless as a controlled injury tool to train the docs as the dwarves are all to ready to hurt themselves guiding my carts.
The tracks these generally happen on are all the same; they're all downward ramps directly down to the mining levels, where people are walking around all the time moving the ore to the linked stockpiles. There's no nonramp tiles, no stops or anything; it's a straight ramp track down to ground level. I know they get crazy fast when pushed down that kind of track, but I figured they'd be fine if guided. Seems like it isn't.
I don't know if the 'Guide Cart' job is getting interrupted and they let go or what, I haven't been able to track down whatever's causing it.
Anyone else having this problem?