Update README.md

Signed-off-by: Ahmed Aredah <[email protected]>

README.md

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 ## Publications
 
-Aredah, A., Du, J., Hegazi, M., List, G., & Rakha, H. A. (2024). Comparative analysis of alternative powertrain technologies in freight trains: A numerical examination towards sustainable rail transport. Applied Energy, 356, 122411.
+Aredah, A.S., Fadhloun, K. & Rakha, H.A. (2024) NeTrainSim: a network-level simulator for modeling freight train longitudinal motion and energy consumption. Railw. Eng. Sci. https://doi.org/10.1007/s40534-024-00331-x
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+Aredah, A., Fadhloun, K., & Rakha, H. A. (2024). Energy optimization in freight train operations: Algorithmic development and testing. Applied Energy, 364, 123111. https://doi.org/10.1016/j.apenergy.2024.123111
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+Aredah, A., Du, J., Hegazi, M., List, G., & Rakha, H. A. (2024). Comparative analysis of alternative powertrain technologies in freight trains: A numerical examination towards sustainable rail transport. Applied Energy, 356, 122411. https://doi.org/10.1016/j.apenergy.2023.122411
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