Yes, it is generally normal for trains to experience significant shaking, vibration, and swaying, a phenomenon known as "hunting oscillation" or simply "ride quality." This movement is caused by several factors, primarily the interaction between the steel wheels and the steel rails. Because train wheels are tapered (conical) rather than flat, they naturally "hunt" for the center of the track, creating a slight side-to-side swaying motion. At higher speeds, this oscillation can become more pronounced. Other causes include "rail joints" (the gaps between sections of track), curves in the line, and unevenness in the "ballast" (the crushed stone support under the tracks). Modern high-speed trains like the Shinkansen or TGV use "active suspension" systems and welded "continuous" rails to minimize this, but older commuter or freight-heavy lines can be quite bumpy. While constant vibration is standard, sudden, violent "jolts" or loud metal-on-metal grinding noises might indicate a flat spot on a wheel or a track defect. For the most part, however, the rhythmic swaying and rattling of a train are expected results of heavy machinery moving at high speeds over a rigid surface, and rail cars are designed to flex and absorb these forces to ensure safety.