Online Calculation of the Pulling Force and Power / achievable Speed

By default the required power and the necessary pulling force of a Railjet (locomotive „Taurus“ 1116 and seven passenger cars) at a speed of 230 km/h are calculated.

  • Suitable values for cars, bicycles and other trains you can find by „Make a choice“.
  • With the default values you are able to perform a calculation immediately by simply pressing the button „Calculate“ or the enter key!
  • You can do the calculation several times, too. Just change the values in the white fields!

This calculator uses SI units!!

Pulling Force and Power Calculator

Number of cars
Coefficient of friction

Please enter a number in seven of the following eight fields, the empty field will be calculated!

Driving/braking power* kW
Speed km/h
Gradient* %
Mass of the loco t
Mass of one car t
Acceleration/decel.* m/s²

Results and error messages (these values are computed by the calculator)

Required coef. of friction
Required pulling force kN
Starting tractive effort
Current consumption A


For experts: entering special values

The following 16 fields must all be filled out!
Make sure to use the correct cross-sectional area!

Efficiency of the drive %
Efficiency of the engine %
Cross sectional area
Supply voltage V
Head-/tailwind* km/h
Air density kg/m³
Curve resistance
Factor of rotating masses
Driven axles
Total number of axles
Rolling resistance of the loco
Rolling resistance of the cars
Air resistance coefficient – loco
Air resistance coeff. – first car
Air resistance – intermediate car
Air resistance coeff. -last car

For these values set a minus in front of the number!

Instructions for this Calculator

  • One oft the following items can be calculated if all the other values are known:
    • Maximum speed. Normally the maximum speed is limited by the engine’s running speed.
    • Power and traction force
    • Maximum tractive effort on starting as a result of the coefficient of static friction.
    • Gradient
    • Possible acceleration
    • Mass of the railroad cars
    • Coefficient of static friction required
  • The listed coefficients of friction apply only at relatively low speeds.
  • As comma you have to use a point.
  • When calculating, engine and drive efficiency can be considered. As standard, an efficiency of 100% is assumed!
  • The calculation is only valid if the load on each axle is approximately the same.
  • No guarantee can be given for the correct function – for corrections and suggestions for improvement, please use the contact form!

Comparative Values for Maximum Traction, Hourly Power, Mass and µH

Please note: the maximum traction is given in kN, the hourly power in kW and the mass in t! K is the abbreviation for kilo and means 1000, so 1 kW = 1000 W, 1 kN = 1000 N.

Example (ÖBB)
Maximum Traction
in kN
Hourly Power
in kW
in t
µH *
Loco 1016/1116 300 6400 86 0.356
Loco 1044/1144 327 5400 84 0.397
Loco 2016 235 2000 80 0.299
Loco 2043 196 1104 68 0.294
Electrical multiple unit 4020 117 1200 129  
Railcar 5047 68 419 47  

Source: Wikipedia

* Necessary coefficient of friction when starting, calculated from the given values.