Delivery time quotient
The transportation time quotient (BFQ) (also transportation time degree) is used in railway management science to denote the quotient of the actual or scheduled travel time to the minimum travel time .
description
By definition, an unimpeded train has a BFQ of 1, as it can run with its minimum travel time without being influenced by disruptive factors. However, this minimum travel time must be deviated from when drafting the timetable. Connections have to be taken into account, train crossings have to be waited for, etc. Thus, the scheduled travel time of the train is longer than its minimum travel time. His BFQ is therefore greater than 1.
Similar to the detour factor in traffic planning is of BFQ for assessing the quality of a certain train path used. If the BFQ is too high, it will be rejected in the timetable construction as not in line with the market.
A distinction can be made between the BFQ timetable and the BFQ operation. The former considers the planned travel times, the latter the actual / realizable travel times in operation or in an operational simulation.
annotation
The basis for the transport time quotient is the minimum travel time . This is not the technically shortest possible travel time, but also contains buffer times and surcharges. It is therefore possible that a BFQ smaller than 1 may occur in real rail operations. In this case, a train is running faster than scheduled.
Individual evidence
- ↑ Jörn Pachl: Glossary of System Technology in Rail Transport , as of March 11, 2011
- ^ A b Matthias Bär: Management of rail and public transport, reprint Bfg 0, p. 4, 2012, TU Dresden , Faculty of Transport Sciences