I've seen people bring bikes on DART and Commuter trains and get away with it, but it probably depends on what staff are on duty on the day. I suspect the worst thing you could do is ask permission - if you just wheel your bike on and look like you know where you're going, chances are most people will assume you've got permission, but if you look like you've got some doubt, you're just asking for someone to challenge you.
Of course, folding bikes are allowed, so if you want to be sure you won't get stuck, buy one of them.
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