I want to know the translation of the word "express" (both characters and pinyin) as you would describe an express courier service? Also, is there a new-invented word (maybe by the youth) that is used today to convey the meaning of express?
Express for train: 特快列车(Te Kuai Lie Che)
Express for delivery service: 快递(Kuai Di)
In fact, all generations in China call express
快递. We call it '快递' in many cases.