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In the paper a new method of railway subgrade investigation is analysed. Contact loss between track and subgrade in vertical plane is considered. During the roadbed investigations the rail is jacked up using a plate called „VSS”. It is assumed that variable temperatures have influence on the rail which is laid on a curved roadbed. Elasticity of the railway roadbed is calculated. Finally formulas and dependences of various types of track structures are obtained.

CONTACT LOSS BETWEEN RAILWAY TRACK AND SUBGRADE IN VERTICAL PLANE DURING ROADBED RESEARCH