# Delay Management in Regional Railway Transport
## 2 Materials and Methods
### Waiting Time Issue
#### 2.2.3 Introduction to the Czech Praxis
In addition to the basic considerations mentioned above, the manual \"Transfer connections between passenger trains\" introduces a method for assigning transfer times. In the table section of the manual are exceptions for basic transfer times for each station, for connection trains using the transfer connection definition, and for basic transfer waiting times. Figure 5 provides an example of such a table where these exceptions are stated for the Protivin station and valid for the timetable for 2019-2020. Regulation D7 (Regulation for operational traffic control [31] of IM SZ) applies to the operational management of services and provides principles for organizing railway traffic during the operational management of services. Implementation procedures for Regulation D7 (\"PND7\") are published for the validity period of the timetable, comprised of parts A and B. Part A of PND7 describes the traffic control structure and activities of individual operational sections of IM SZ, which correspond to the valid timetable, and for the determination of mutual duties and responsibilities. In addition, it contains regulations that are permanently valid for the whole net, as well as temporary regulations that are valid for one period of the timetable, related only to certain central dispatcher districts. Part B of PND7 determines the rules of railway traffic control for individual railway lines and provides additional information about train operating companies, intended for railway traffic control employees. The rules are valid for one period of the timetable. No timetable of the trains of other train operating companies can be changed if the companies do not agree. PND7 provides manuals for operational traffic control on railway lines, where applicable, as well as tolerable anomalies from the general traffic control rules. In part B, there are usually instructions related to the following:  
* cases of an increase in the tolerance of a higher category train's delay, influenced by a lower category train ride;
* changes of a train sequence, depending on the level of delay (crossing, overtaking relocation, etc. );
* transfer binding relocation to another traffic point, when certain operational disruptions occur;
* cancellation of a pair of trains in a section when certain operational disruptions occur (e.g., disruptions due to elimination of a delay transmitted during train set reversion);different circulation bindings of the train sets, when certain operational disruptions occur (e.g., disruptions due to delay elimination);
* additional stops for arranging connections for services that would otherwise be canceled (or the travel time disproportionally extended) due to certain operational disruptions;
* the introduction of substitute trains for arranging connections, where service would otherwise be canceled (or the travel time disproportionally extended) due to certain operational disruptions;
* transfer waiting times between train and bus services. Measures mentioned in PND7 can influence transfer waiting times values; therefore, it is necessary to assign transfer waiting times simultaneously, ideally, using the manual to solve common operational disruptions that are stated in PND7.