7 Track Profiles

The track profile describes all parameters of the track related to the braking distance. It also contains all relevant parameters of the movement authority (MA), such as EoA/LoA, SvL, target speed etc.

All locations stated in the track profile are positive values refering to a virtual zero location and increasing with the train running in nominal direction.

All properties of the track profile are stored in the track profile file (extension .tp). A track profile that has not been saved after the latest modification is marked with an asterisk ’*’ in its title in the tab pane.

7.1 The Track Profile Panel

All data is entered via the track profile panel, shown in figure 12.


PIC

Figure 12: A track profile panel


7.1.1 MRSP

The only parameter in this section is the trackside speed restriction relevant in ceiling speed monitoring.

Note: The value is named ”v_MRSPn” here in accordance to [Subset 026-3], even though the value does not need to consider the train related maximum speed. If the train related maximum speed stated in the train model used in a scenario is less than the value stated here, the train related maximum speed will be used.

7.1.2 MA Data

ETCS Version

The requirements regarding calculation of TSM related data has been changed between diffent ETCS versions (compare the different versions of Subset-026 chapter 3, i.e. versions 2.3.0d, 3.4.0, 3.6.0), therefore it is necessary to state the version of the trackside ETCS.

For ”Baseline 2” it is presumed, that CR595 or [Subset 026-6] is implemented by the ETCS on-board, and that either packet 203 is sent by trackside and considered by the ETCS on-board or the ”correction factors” are stored on-board. If this cannot be ensured, the results can only be a rough estimation of the behaviour of the train, since in ”pure” Baseline 2 (version 2.0) no harmonized brake models exist.

Type of Target

Select whether the target is an ”End of Authority” (EoA) or a ”Limit of Authority” (LoA).

Target Data

In case of an EoA, the EoA location and the superised location (SvL) has to be entered.

In case of an LoA, the LoA location and the target speed has to be entered.

The locations must be positive values, with SvL greater or equal to EoA.

The distance from zero to the stated EoA location must be at least as large as the indication curve distance or guidance curve distance for the stated v_MRSPn or the maximum train speed. If this is not fulfilled, calculation of the scenario will fail.

Release Speed Data

If the MA requires to calculate the release speed (RS) on-board, select the ETCS level related to the MA.

If the MA requires to use a fix release speed (either ”national value” or value given in MA), set the fix release speed value here.

Note: Typically the release speed should be calculated on-board. Using a fix release speed is typically either not safe or not beneficial from operational point of view (or even both).

7.1.3 Gradients

Enter the track gradients in the table. The start locations shall be strictly increasing. The first start location that is less then the previous determines the end of the profile, i. e. this value and all following values won’t be considered.

7.1.4 Reduced Adhesion Sections

Enter the sections with reduced adhesion in the table. The start locations shall be strictly increasing. The second line states the length of each section. The sections should not overlap.

7.1.5 Balise Locations

Enter the locations of balises that can be used for re-location up to the EoA. The second line states the location inaccuracy for each balise.

7.1.6 Inhibit Brakes Locations

If some special brake shall be inhibited, select the checkbox and enter the correspondent location.

Note: It is assumed that it does’t make sense to re-enable a special brake while braking to a target, therefore the behaviour of the train with respect to (re-)enabling a special brake is not modelled in the train model, and thus you cannot enter a ”special brake profile” here.