Fast train.

The term 'fast train' is a combination of two older English words: 'fast' and 'train.' The word 'fast' comes from the Old English 'fæst,' meaning 'firmly fixed, secure, steady, strong, safe.' It is related to Old Norse 'fastr' (firm, fixed), Dutch 'vast' (firm, fixed), and German 'fest' (firm, solid). The sense of 'rapid, quick' developed from the idea of something being 'firm' or 'close' in movement, thus completing a journey in a short time. This sense of speed began to emerge in Middle English around the 13th century and became more prominent by the 16th century. The word 'train' has its origins in Old French 'trahiner' or 'trainer,' meaning 'to pull, to draw.' This, in turn, came from the Vulgar Latin *traginare, derived from Latin 'trahere,' meaning 'to pull, to draw.' In English, 'train' first appeared around the 14th century, referring to a trailing part of a gown, or a series of followers, or a prolonged sequence of events. The specific meaning of 'a line of railway carriages or wagons coupled together' emerged in the early 19th century with the advent of steam locomotives and railways. The concept of a 'train' as a mode of transport began to solidify during this period as railway systems developed. When combined, 'fast train' therefore refers to a railway vehicle or series of vehicles designed and operated to move at a high velocity. This compound term became common as railway technology advanced, and different types of trains were categorized by their speed and purpose. The need to distinguish between trains that stopped frequently (local trains) and those that traveled quickly between major points (express or fast trains) led to the popularization of this descriptive phrase.