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A SUBWAY TRAIN-STEEL SPRING FLOATING SLAB TRACK-TUNNEL COUPLING DYNAMIC MODEL, CONSIDERING SHORT AND MIDDLE-LONG WAVELENGTH RANDOM TRACK IRREGULARITIES, AND LONGITUDINAL CONNECTION BETWEEN ADJACENT SLABS OF STEEL SPRING FLOATING SLAB TRACK, WAS DEVELOPED. THEN, THE INFLUENCE OF SLAB LENGTH ON DYNAMIC CHARACTERISTICS OF THE SYSTEM UNDER DIFFERENT TRACK CONDITION IS THEORETICALLY STUDIED. THE CALCULATED RESULTS SHOW: (1) IN GENERAL, THE ACCELERATION OF EACH COMPONENT OF THE COUPLED SYSTEM DECREASES WITH THE INCREASE OF SLAB LENGTH UNDER THE PERFECTLY SMOOTH TRACK CONDITION; (2) SLAB LENGTH HAS DIFFERENT INFLUENCE LAW ON ACCELERATION OF EACH COMPONENT OF SUBWAY TRAIN- STEEL SPRING FLOATING SLAB TRACK-TUNNEL COUPLED SYSTEM UNDER RANDOM IRREGULARITY OF TRACK CONDITION. THE LOWER THE DOMINANT FREQUENCY DISTRIBUTION OF VIBRATION ACCELERATION, THE HIGHER INFLUENCE SLAB LENGTH HAS; (3) WITH THE INCREASE OF SLAB LENGTH, THE FORCES OF RAIL, FASTENER AND STEEL SPRING ALSO DECREASE SIGNIFICANTLY, WHICH HELP TO LENGTHEN THE SERVICE LIFE OF THESE COMPONENTS; (4) WITH THE INCREASE OF SLAB LENGTH, THE LONGITUDINAL BENDING MOMENT OF SLAB INCREASES SHARPLY AT FIRST, THEN IT BEGINS TO DROP SLIGHTLY. WHEN SLAB LENGTH EXCEEDS THE DISTANCE BETWEEN TWO BOGIES OF A VEHICLE, THE LONGITUDINAL BENDING MOMENT OF SLAB CHANGES LITTLE.
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