The first part of the thesis describes elements of the railway superstructure and formation (rail, sleeper,
rail joints, ballast bed, blanket layer and formation). These descriptions are based on Pravilnik o
zgornjem ustroju železniških prog (published in UL RS 92/100), standard Aggregates for railway
ballast SIST EN 13450:2003, standard Earthworks and track bed for railway lines UIC Code 719 R
(2008) published by International Union of Railways and on technical specifications for roads. The
second part introduces the calculation of forces and stresses through the cross section of the railway
line under traffic load. Dynamic impacts are taken into account by Eisenmann's theory. Presented is
Eisenmanns simplification of the Hertz theory for wheel–rail contact, for determination of the
maximum shear stress in the rail head, Zimmermann's method to calculate the forces and stresses in
the superstructure, Odemark's theory and the calculation of contact stresses on individual contact
layer.
Last part of the thesis presents the calculation of forces and stresses through the cross section of the
railway line under traffic load of the Siemens locomotive SŽ 541 for the chosen composition of the
superstructure. Maximum shear stress in the rail head, bending stresses in the rail foot, contact stresses
at the rail – sleeper contact, contact stresses at the sleeper – ballast bed contact and contact stresses at
the ballast bed – formation contact are calculated.
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