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Two freight platform wagons connected together
conventionally or in the form of so-called rigid connection
were taken into account to investigate the influence of
unsupported sleepers on climb flange derailment on tran-
sition curve. Presented results are related to the freight
wagons equipped with two-axle Y25 standard bogies,
entering at an acceptable speed in the transition curve
of the track with the radius of 150 or 1,000 m. Three cases
have been analyzed: only the inner rail, only the outer
rail, or both rails had unsupported sleepers. Simulation
models were prepared using the VI-Rail software and
nonlinear wheel–rail contact model. The dynamic calcu-
lations showed that wheel flange climb derailment caused
by unsupported sleepers will only occur if deflection of
the rail or track on transition curve is deep enough. These
tests allowed us to determine the relationship between
the radius of curvature and the depth of the trough
causing derailment of the wagons. Calculation results
allowed us to answer also the questions whether the
method of connection and the weight of freight wagons
have a significant impact on the wheel flange climb
derailment.