Within the seminar series of ITU ITS Research Lab and ITS course in Fall 2020,Ibrahim Ethem Demirci, who is the R&D and Engineering Services Manager at TCDD Technic Engineering and Consulting Joint Stock Company, gave an invited talk on 'Energy Efficient Train Operations'. Mr. Demirci's talk focused on the utilization of regenerative braking energy in timetable optimzation of subway systems.