Hang around a large-enough Twitch channel and you'll eventually see a sub or bit train -- a moment where the hype kicks off and the streamer ends up with a mountain of donations. Twitch wants to seize on those sprees. It's launching a Hype Train feature this week that hands out free emotes to donators when they fill up an on-screen meter. A train starts when enough subscriptions or bit cheers occur in a certain amount of time (streamers can choose a threshold). After that, any subs or 100-plus bit cheers contribute to the meter. There are five levels of emotes with five levels each, so you'll have an incentive to keep frenzies going for a while.