Thanks for some wonderful feedback, everyone. I'm feeding on it like a pack of hungry Scotsmen on a battered-and-deep-fried-horse (with Ketchup).
When I say railroading, I mean the point at which my players either revolt or get cynical. It's different for every group. Icar is set up as a series of events on timelines. A series of events lay out a plot. The players never interact with all of the timelines but it gives them the feeling of something larger going on.