fa Railway track and structures Railway track and structures پژوهشي Research In the area of the railway infrastructure, planning for track maintenance is a challenging problem due to the coordination between train traffic and maintenance operations. In this paper, we discuss the simultaneous scheduling of trains and operations for a single-track line, where stochastic mathematical programming is applied to minimize both the travel time of trains and maintenance duration. The uncertainty in the blockage duration of track is considered in the model to reduce the impact of unexpected delays in maintenance operations. The proposed model also considers the practical aspects which has been less addressed in the previous researches regarding track maintenance. We reformulated the stochastic problem to the deterministic equivalent to facilitate solutions for realistic sizes. The computational result for a real track shows that the model can efficiently find simultaneous scheduling of trains and operations and suggest optimal blockage duration at different confidence levels. The impact of timetable comparison on the blockage duration for a heavily utilized line is also evaluated. Track maintenance, Simultaneous scheduling, Stochastic programming, Blockage 53 64 http://ijrare.iust.ac.ir/browse.php?a_code=A-10-229-2&slc_lang=fa&sid=1 Mostafa Bababeik 180031947532846002361 180031947532846002361 No School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran Mohammad Farjadamin 180031947532846002362 180031947532846002362 No School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran Navid Khademi navid.khademi@ut.ac.ir 180031947532846002363 180031947532846002363 Yes School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran Amir-Hossein Fani 180031947532846002364 180031947532846002364 No 2Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran 2Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran