Actually the countdown doesn't begin once it's off the block. It can't even move until, in some cases of train operation, the train before the train sitting on the launch crests the giant lift (there's a block segment there), so once it does that, the block releases and begins the countdown. Small tidbit
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And A7X, I still haven't decided about that yet. I don't really have experience custom supporting, so I might mod the wood magic, but like I said, I still haven't decided.