  In wheel rail adhesion studies, most of the test rigs used are simplified
designs such as a single wheel or wheelset, but the results may not be
accurate. Alternatively, representing the complex system by using a full
vehicle model provides accurate results but may incur complexity in design. To
trade off accuracy over complexity, a bogie model can be the optimum selection.
Furthermore, only a real time model can replicate its physical counterpart in
the time domain. Developing such a model requires broad expertise and
appropriate software and hardware. A few published works are available which
deal with real time modeling. However, the influence of the control system has
not been included in those works. To address these issues, a real-time scaled
bogie test rig including the control system is essential. Therefore, a 1:4
scaled bogie roller rig is developed to study the adhesion between wheel and
roller contact. To compare the performances obtained from the scaled bogie test
rig and to expand the test applications, a numerical simulation model of that
scaled bogie test rig is developed using Gensys multibody software. This model
is the complete model of the test rig which delivers more precise results. To
exactly represent the physical counterpart system in the time domain, a
real-time scaled bogie test rig (RT SBTR) is developed after four consecutive
stages. Then, to simulate the RT-SBTR to solve the internal state equations and
functions representing the physical counterpart system in equal or less than
actual time, the real-time simulation environment is prepared in two stages. To
such end, the computational time improved from 4 times slower than real time to
2 times faster than real time. Finally, the real time scaled bogie model is
also incorporated with the braking control system which slightly reduces the
computational performances without affecting real time capability.
