I took the bike on in a garbage bag this morning. The conductor let me on, but at one point told me I needed to get a real bag. I'm on the edge of rush hour though. My train gets in at 9:21 and supposedly any train after 9:30 can have non-folders on it. I imagine a lot of how they react will be what side they got out of bed on in the morning. I just don't want to get stranded because I can't follow the letter of the rules. I ended up ordering one of the new dahon carry-on bags (the one that packs into a seat-post bag) from Thor. We're pretty close so I should have it in the next day or two.