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It clicks because of expansion during the hot weather causing gaps where each rail joins. When the train passes over these gaps it clicks as the wheels pass from one rail to the next.

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13y ago

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What is the sound made by a train?

In the US, most major main line railroads have "continuous welded rail" (CWR) on high use tracks, so the train noise is limited to wheels scraping against the rail, rattles, and the locomotive - plus the wind noise at higher speeds. What you most likely refer to is the "clickety-clack" that is common on more lightly used rail lines. The click-clack is made by the pairs of wheels passing over the rail joints, and is more noticeable in the winter than the summer (due to heat expansion of the rails). The typical US rail length is 39 feet for this segmented rail, so by counting the click-clack you can actually calculate the speed of the train if you are riding in it - count click-clack for 39 seconds - then divide the count by 1.5 and you have the train speed in miles per hour. (example: 39 click-clacks = 26 mph)


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