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Critical Sources of Aerodynamic Resistance in a Medium Distance Urban Train: a CFD approach - pp. 111-124Figure 14Sensor location in experimental testFigure 15Travel and air speed comparison, the data was obtained at the line A.mental measurements. The obtained value was11.68 m/s or 42.1 km/h, which means that theerror between the In situ experimentation andthe simulation results is 2.7%, a considerablylow value showing that the simulated results arein agreement with reality.Preliminary evaluation ofaerodynamic changesUsing the information obtained from thesimulation of the train in its current status, somechanges in the configuration of the train wereproposed which could reduce the drag and powerconsumption values previously presented. It isclear that the main contributing phenomenonto aerodynamics drag is the impact of the fluidagainst geometries that do not propitiate thesmooth flow around them; hence if it is possibleto improve this situation to reduce the opposingforce generated by air to the train.For operational and safety issues, it is not possibleto make drastic changes in the current lengthand width of the train (see Figure 17 A), and thusmodifications need to respect such limitations. Itwas mentioned that a feature as the hollow in theRevista Científica Guillermo de Ockham. Vol. 11, No. 1. Enero - junio de 2013 - ISSN: 1794-192X ‣ 121