K-series trains

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The K series (Chinese: 快速旅客列车) is a train service speed level by China Railway. K stands for "kuaisu" (lit. 'fast-speed'). However, they are likely to be the most commonly seen trains in China. Those trains make less stops than the number-only trains, but run at the same speed as them. For this, the K-series are sometimes mentioned as "Keng" (a scam) by Chinese Railfans.^{[original research?]} Train numbers are written in the form of K*** or K****, but the letter K reads as "kuai (快)" in station announcements and radio contacts.^[1]