The trucks gain/gather 'speed' as they drive down the hill. = The trucks pick up 'speed' as they drive down the hill. [=the trucks go faster as they drive down the hill]
He types at a 'speed' of about 50 words per minute. = His typing 'speed' is about 50 words per minute.
Let me 'bring you up to speed' on our plans. [=let me tell you about the changes in our plans]
(..) makes this one here a bit superfluous, really. The Dauntless is the power in these waters, true. But there's no ship as can match the Interceptor for speed. I've heard of one. It's supposed to be very fast. Nigh uncatchable. The Black Pearl. Well, there's no real ship (..)2003 Pirates of the Caribbean: The Curse of the Black Pearl