| The main energy efficiency effect comes from reduced weight. General figures on the weight reduction effect through Jakob-type bogies are not available, but the following estimate illustrates the potential: - In a conventional EMU, the mass of the bogies accounts for about one third of the total train weight.
- The introduction of Jakob-type bogies reduces the ratio of bogies to cars by 30-50% (depending on train length).
- On the other hand, the car length is reduced by about 25 %.
- Therefore the number of bogies per train length is reduced by roughly 10-30%.
- Assuming that Jakob-type bogies have roughly the same weight as conventional bogies, this means that the weight of bogies per train length is reduced by 10 - 30%.
- This means a mass reduction potential of about 3 - 10 %, given that bogies account for about one third of the total train weight.
The following elasticity table gives the effect on overall energy demand for different types of operation: |
| Traction | Brake energy recovery | Effect on train mass | Elasticity with regard to train mass | Effect on
total energy consumption for traction | | High speed train | electric | no | 3 - 10 % | 0,17 | 1 - 2 % | |
|
| yes | 0,12 | 0 - 1 % | | Intercity train | electric | no | 0,19 | 1 - 2 % | |
|
| yes | 0,14 | 0 - 1 % | |
| diesel | - | 0,19 | 1 - 2 % | | Regional train | electric | no | 0,52 | 2 - 5 % | |
|
| yes | 0,44 | 1 - 4 % | |
| diesel | - | 0,52 | 2 - 5 % | | Suburban train | electric | no | 0,64 | 2 - 6 % | |
|
| yes | 0,57 | 2 - 6 % | |
| diesel | - | 0,64 | 2 - 6 % | | Range: | 0 - 6 % | Source: IZT |
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date created: 2002-10-09
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