broadband (n.)youdaoicibaDictYouDict
type of high-speed Internet access widely available from 2006, from broad (adj.) + band (n.1).
mega-youdaoicibaDictYouDict
before vowels meg-, word-forming element often meaning "large, great," but in precise scientific language "one million" (megaton, megawatt, etc.), from Greek megas "great, large, vast, big, high, tall; mighty, important" (fem. megale), from PIE *meg- "great" (cognates: Latin magnus, Old English micel; see mickle). Mega began to be used alone as an adjective by 1982.
High-speed computer stores 2.5 megabits [headline in "Electronics" magazine, Oct. 1, 1957]
Metroliner (n.)youdaoicibaDictYouDict
U.S. high-speed inter-city train, 1969, from metropolitan + liner.
ShinkansenyoudaoicibaDictYouDict
"(In Japan) a railway system carrying high-speed passenger trains", Japanese, from shin 'new' + kansen 'main line'.