EJ2440 Electric Transportation 6.0 credits

Elektriska transportsystem

  • Education cycle

    Second cycle
  • Main field of study

    Electrical Engineering
  • Grading scale

    A, B, C, D, E, FX, F

Course offerings

Spring 19 for programme students

Spring 20 for programme students

Intended learning outcomes

Aim of the course is to give a broad insight into electrification of both rail and road bound transportation systems.

After completed course the student should be able to:

  • describe fundamental system issues in electric transportation including e.g. tractive demands and power and energy consumption;
  • calculate tractive effort, power, acceleration and velocity of rail and road vehicles;
  • make estimations of voltages, currents and power of electrical drives for electric transportation;
  • explain the most important electric drives for rail vehicles;
  • describe generic hybrid topologies;
  • explain how a hybrid vehicle works and describe its main components and their function;
  • construct and apply models for electric and hybrid vehicles in order to analyse their performance;
  • describe the operating principle for energy storage components, such as batteries and super capacitors, and calculate basic performance of them;
  • describe the design of ac and dc power supplies for electric railway traction;
  • calculate the power capacity for different railway power supply systems;
  • describe the background to electromagnetic interference in electric traction.

Course main content

Historical survey.

Driving factors for environment friendly transportation.

General principles of electric traction and traction system. Tractive and braking effort. Power requirements and energy consumption.

Propulsion and auxiliary systems for conventional light and heavy road vehicles.

Propulsion and auxiliary systems for electric and hybrid vehicles.

Rail-borne vehicles; electric drives, transformers and converters, control and mechanical transmission.

Power supply systems; AC and DC supplies, power capacity, overhead catenary systems, over voltages, line interferences. Electromagnetic compatibility (EMC).

Development trends.


Lessons, computer-aided exercises, seminar and project .


Knowledge comparable to at least 2 of the following courses: EJ1200 Electric Power Systems, EJ2201 Electrical Machines and Drives or EJ2301 Power Electronics.

Recommended prerequisites

One of the following courses are recommended; EJ2201 Electrical Machines and Drives, EJ1200 Electric Power systems or EJ2301 Power Electronics


Östlund, S.- Elektric Railway Traction, KTH 2012

Course binder Hybrid Vehicle Drives, KTH 2014


  • PRO1 - Project Work, 2.0, grading scale: P, F
  • TEN1 - Written Exam, 4.0, grading scale: A, B, C, D, E, FX, F

Requirements for final grade

Passed in all examination moments.

Offered by

EECS/Electrical Energy Engineering


Oskar Wallmark (owa@kth.se)


Stefan Östlund <stefano@kth.se>

Supplementary information

N.B. EJ2440 Electric Transportation contains partly the same material as EJ2400 Electric Traction and EJ2410 Hybrid Vehicle Drives. It is therefore not possible to include EJ2440 and EJ2400/2410 for the same degree.


Course syllabus valid from: Spring 2019.
Examination information valid from: Spring 2019.