@hawkeye10,
Sure, Kumaritashvili goofed.. somewhere early on I read some apparent knowledgeable observer say he was apprehensive as he lifted his head just before, I forget who.. But, given the olympics include athletes not of just the + 90 mph types, some with arguable practice at the exact site, the course should not be so punishing for failure.
Me, I'm guessing it had to do with the curved instead of rectangular shape of the ice course - just read about that on huffpo (have to check that is where) in the context that that is something they just quickly changed.
Is the basic luge track design one thing, and its icing pattern another?
Farmer's early questions re nets, etc. make sense.