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William Liu

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Researcher ID

About me

At KTH, I work as a permanent researcher with a focus on railway energy and railway sustainability. I have been working and researching in the railway field since 2008. I have joined the system development and commissioning trials of the high-speed railways (with a top speed of 420 km/h). To make rail transport more reliable, more affordable and more attractive, in the past 15 years I have participated in more than 20 railway-related research projects and published more than 40 publications (conference and journal articles) about research on rail transport systems. I have been acting as PI in 4 research projects (financed by EU, Swedish governmental agencies and railway industry) and Co-PI in 3 research projects. At the same time, I also contribute to the railway education at KTH. I am a teacher in 9 courses on transport systems. I have been the main supervisor of 5 bachelor's theses and 10 master's theses. I also act as co-supervisor of several doctoral students. I have also looked into the theory of pedagogy in higher education and finished 5 pedagogical courses at KTH. Based on the pedagogical theory and my experience in teaching and supervision, I have written a report that is included in the course material of a pedagogical course(LH219V) at KTH.

Work experience:

  • Researcher in Rail Vehicle Technology, KTH Royal Institute of Technology, Stockholm. 2020.01 - now
  • Member of Swedish Electrical Standardization Committee (SEK Svensk Elstandard). 2020.06 - now
  • Member of Swedish Society of Mechanical Engineers (Mekanisterna), 2022.11 - now
  • Postdoc in Rail Vehicle Technology, KTH Royal Institute of Technology, Stockholm. 2017.12 - 2019.12
  • Researcher at China Academy of Railway Sciences (CARS), Beijing. 2011.06 - 2013.05
  • Research Engineer at China Academy of Railway Sciences (CARS), Beijing. 2009.06 - 2011.05
  • Intern at China Academy of Railway Sciences (CARS), Beijing. 2008.


  • Doctor of Philosophy in Vehicle Engineering, KTH Royal Institute of Technology, Stockholm. 2013.09 - 2017.11
  • Licentiate of Technology in Vehicle Engineering, KTH Royal Institute of Technology, Stockholm. 2013.09 - 2015.10
  • Master of Science in Mechanical Engineering, Tianjin University, Tianjin. 2007.09 - 2009.06
  • Bachelor of Science in Mechanical Engineering, Harbin Institute of Technology (HIT), Harbin. 2003.09 - 2007.06


  • Rail Vehicle Technology (SD2307), master level, Teacher

  • Vehicle System Technology (SD2221), master level, Teacher

  • Energy System (MJ1145), bachelor level, Teacher

  • Energy Technologies for Sustainable Transport (MJ2506), master level, Teacher

  • Vehicle Engineering (SD1002), bachelor level, Teacher

  • Railway system and rail vehicle technology, Professional education for industry, Teacher

  • Vehicle dynamics project course part I (SD2229), master level, Teacher

  • Vehicle dynamics project course part II (SD2230), master level, Teacher

  • Energy technologies for sustainable transport (MJ2506), master level, Teacher

  • KTH Delsbo Electric Team, Advisor


  • Bachelor's theses (5)

[1] Jakob Lindbergh and Hector Älfvåg, Optimering av tågs kontakt med kontaktledning – utplacerade massors påkerkan på kontaktkraftens kvalitet (in Swedish), 2019.

[2] Alice Zhang and Gustav Ström, Delsbo electric: Design och tillverkning av bottenplatta till ett rälsfordon (in Swedish), 2022.

[3] Ludvig Danström, Delsbo electric: Optimering av fjäder-dämpar system (in Swedish), 2023.

[4] Olof Skagerlind and Gabriel Forsling, Delsbo electric: Optimering av hjuldesign (in Swedish), 2023.

[5] Oliver Rehn, Delsbo electric: Energiförbrukning & köroptimering (in Swedish), 2024.  (ongoing)

  • Master's theses (10)

[1] Philipp Geiberger, Analysis of the electrical energy consumption of LKAB’s iron ore trains, 2021.

[2] Alexandra Jerresand and Micaela Diamant, Energy usage of smart wayside object controller, 2021.

[3] Filipp Zarov, Life cycle cost of smart wayside object controller, 2021.

[4] Gaston Holmström, Pantograph-catenary wear modelling using dynamic simulation, 2022.

[5] Sidharth Kapoor, Energy usage of railway wayside object heating, 2022.

[6] Jimmy Liden, Optimization of comfort-related energy of Stockholm commuter trains, 2023.

[7] Siddharth Sumathi, Modelling of heat transfer of railway switch heating, 2023.

[8] Yijing Pang, Optimization of traction energy of Stockholm commuter trains, 2023.

[9] Gökmen Dursun, Cost modelling of optimizing train operation and upgrading infrastructure for decision-making, 2023/2024. (ongoing)

[10] Kangli Chen, Modelling of power supply systems of Stockholm local rail transport, 2023/2024. (ongoing)

  • Doctoral students (Co-supervisor):

[1] Bastian Schick, Pantograph-catenary dynamic interaction

[2] Yanjun Zhang, Braking system of rail vehicle

[3] Yan Xu, Rail vehicle dynamics under adverse conditions

[4] Sidharth Kapoor (Research engineer),  Railway system energy simulation



Energy Technologies for Sustainable Transportation (MJ2506), teacher | Course web

Rail Vehicle Technology (SD2307), teacher | Course web

Vehicle Dynamics Project Course Part 1 (SD2229), teacher | Course web

Vehicle Dynamics Project Course Part 2 (SD2230), teacher | Course web

Vehicle Engineering (SD1002), teacher | Course web

Vehicle System Technology (SD2221), teacher | Course web