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2. Westinghouse Electric & Manufacturing Company, “New York, New Haven, & Hartford Railroad Electrification” June 1924.
3. Esveld, C., Engineering, R., Delft, T.U., Railway, E., Editorial, R., & Member, B. (2009). “The significance of track resilience.” Esveld.Com, 1-5. Retrieved from http://www.esveld.com/Download/ERR_track_resilience2.pdf.
4. Zambito, Thomas. “Crumbling Ties Cost Metro-North in Overtime.” Lohud.com. The Journal News, 21 Jan. 2016. Web. .
5. Metropolitan Transportation Authority. (2017). “Metro-North Penn Station Access.” Retrieved from http://web.mta.info/mta/planning/psas/pdf/PennAccess_MTAweb.pdf.