The energy savings strongly depend on the point of reference chosen. Compared
to old locomotives the potential is higher than compared to modern stock. The
experience with retrofit projects in Switzerland, Austria and Russia demonstrate
that in extreme cases (freight trains on certain routes) the savings can amount
to 5 % and more. Usually they will be lower.
Figure 1 shows the relation between tractive power and the auxiliary power
expressed as a percentage for the case of fixed ventilation (no
demand-controlled operation).
Figure 1: Relationship expressed in percentage terms between the auxiliary
power and real-time tractive power using the example of a 5 MW traction
unit.
Source: IZT, data from Slattenschek 2000 |