FIELD: railway transport; testing.
SUBSTANCE: according to proposed method, frame forces acting onto each wheel-set are measured at passing of each fixed point of rail track by all wheel-sets. Simultaneously side (cross) irregularities of rail lines are measured by cordless methods and basing of received information, six independent equations are set up 
where 1, j = 1,2,3,4, are wheel-sets; 
and 
are side rigidities of left-hand and right-hand rail line in k-th fixed point on rail track; 
and 
where 
and 
are irregularities of left-hand and right-hand rail lines measured at passing of k-th fixed point by i-th wheel-set; 
where 
is frame force acting onto i-th wheel-set at passing k-th fixed point of track. Then system is chosen from six equations consisting of two equations so that system should be nonuniform 
and definite (determinant 
and values of rigidities 
and are found by Cramer formula.
EFFECT: possibility of measuring side rigidity of rail lines by track testing car.
2 cl
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