Braking ratio
The braking ratio is a percentage for evaluating the braking ability of a railway vehicle or a train .
The braking ratio is a quotient of the braked weight of a vehicle or train and its actual mass (weight). This enables the braking performance of different trains with their different loads to be compared with one another. The braking ratio is used by the Swiss railways to determine the train speed .
Brake bill
The braking ratio of a train is calculated as follows:
The brake series and the train series are then determined from the braking ratio . The train speed, which is determined with the route table, depends on this .
With the same braking ratio and the same type of braking , different vehicles or trains have the same braking distance when braking quickly from the same speed .
Partial braking ratio
The partial braking ratio guarantees a braking effect on Swiss railways in order to bring the individual train parts safely to a standstill in the event of a train separation and to prevent them from escaping.
If all vehicles in a train are braked, the partial braking ratio does not need to be checked. Otherwise the partial braking ratio from the end of the train and the tip of the train to the possible separation points must be calculated.
Example:
- Locomotive (dead weight 120 t, G-brake weight 72 t)
- Trailer load 1600 t
- The first five cars have no G-brakes (brakes off).
From the end of the train, the lowest partial braking ratio is 61%. This means that a gradient of up to 44 ‰ can be negotiated.
Calculated from the front, the lowest partial braking ratio is 18%, which means that a gradient of 7 ‰ can still be negotiated.
Braking conditions of some vehicles
| Locomotive, multiple unit | v max | R + EP | R. | P | G | towed |
|---|---|---|---|---|---|---|
| SBB Re 4/4 II | 140 km / h | - | 125% | - | 90% | 90% |
| SBB Re 450 (Zurich S-Bahn, 1st generation) | 130 km / h | - | 115% | - | 85% | 85% |
| SBB Re 460 ("Lok 2000") | 200 km / h | - | 125% | - | 90% | - |
| SBB Ae 6/6 | 120 km / h | - | 100% | 75% | 75% | 75% |
| SBB Re 6/6 | 140 km / h | - | 125% | - | 90% | 90% |
| SBB RABDe 500 (ICN InterCity tilting train) | 200 km / h | 209% | 176% | 114% | 114% | 114% |
| RABe 514 (DTZ of the S-Bahn-Zurich) | 140 km / h | - | 164% | - | - | 100% |
| SBB RBe 4/4 | 125 km / h | - | 118% | - | 76% | 76% |
| SBB RBDe 560 (NPZ, Domino) | 140 km / h | - | 126% | - | 100% | 100% |
| BLS Re 465 | 160 km / h | - | 136% | - | 90% | - |
| SOB RBDe 562 (SOB-Flirt) | 140 km / h | - | 126% | - | 100% | 100% |
| Passenger cars | v max | R + EP | R + SB | R. | P |
|---|---|---|---|---|---|
| ÖBB Railjet intermediate car Bmpz, ARbmpz, Ampz | 230 km / h | 161-155% | - | 145-150% | 105-109% |
| ÖBB Railjet control car Afmpz | 230 km / h | 157% | - | 147% | 107% |
| SBB EW IB (gray-blue) | 140 km / h | - | - | 130% | 130% |
| SBB EW II A (green) | 140 km / h | - | - | 134% | 134% |
| SBB EW II B (green) | 140 km / h | - | - | 130% | 91% |
| SBB EW IV A, B, WRM | 200 km / h | - | 157-148% | 138-147% | 102-109% |
| SBB IC Bt ( EW IV ) | 200 km / h | 153-150% | 145-143% | 133-136% | 106-108% |
| SBB D ex SNCF | 160 km / h | - | 144% | 135% | 135% |
| SBB IC2000 (Dosto) A, AD, B, Bt, BR, WRB | 200 km / h | 152% | 143% | 135% | 108% |
| SBB BPM 51 | 160 km / h | - | - | 133% | 133% |
| SBB Eurocity car Apm, Bpm | 200 km / h | - | - | 145% | 106% |
| SBB Eurocity car Apm and Bpm refit | 200 km / h | 152% | 146% | 136% | 100% |
See also
Individual references, comments
- ↑ Institute for Transport Planning and Transport Systems : Glossary of Public Transport ( Memento of the original from February 23, 2012 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , ETH Zurich
- ↑ Jörn Pachl: Glossary of System Technology in Rail Transport , accessed on June 26, 2013
- ↑ Jürgen Janicki, Horst Reinhard: Rail Vehicle Technology. Bahn Fachverlag, 2008, ISBN 978-3-9808002-5-9 .
- ↑ Swiss Driving Regulations (FDV) A2016 Federal Office of Transport (FOT), July 1, 2016 (PDF; 3 MB). R 300.5, Section 3.2 Brake calculation
- ↑ Swiss Driving Regulations (FDV) A2016 Federal Office of Transport (FOT), July 1, 2016 (PDF; 3 MB). R 300.5, Section 3.7 Application of the train and brake series
- ↑ Swiss Driving Regulations (FDV) A2016 Federal Office of Transport (FOT), July 1, 2016 (PDF; 3 MB). R 300.5, section 3.5.4 partial braking ratio
- ↑ when using brake table 90
- ^ Lilian Meier: Driving Service. Summary for train staff from driving regulations, operating regulations, implementation regulations, R174.1 and work instructions . Alterswilen, 2011
