IS:derailer

derailer
 

Schema description / Schemenbeschreibung

Position of derailer in the XML-Tree / Position von derailer im XML-Baum

• Parent: <derailers>
• Children: <additionalName> (introduced with version 2.1), <any>, <geoCoord>, <states>

Multiplicity / Anzahl

[1..1]

Semantics / Bedeutung

A <derailer> is a device used to prevent fouling of a rail track by unauthorized movements of trains or unattended rolling stock. It works (as the name suggests) by derailing the equipment as it rolls over or through the derail. [1]

Attributes of derailer / Attribute von derailer

• id: XML-file-wide unique, machine-interpretable identity, required for later referencing that element internally. For a detailed explanation see Dev:identities.
  XML-Datei-weit eindeutige, maschineninterpretierbare Identität, die für die spätere interne Referenzierung dieses Elements erforderlich ist. Für eine detaillierte Erklärung siehe Dev:identities.

• code (introduced with version 2.1): This is a short string for typical, specific abbreviations, used in different systems with the same understanding.

• name: This is a short name for the current item.

• description: This is a more detailed description as addition to the short name. It shall allow a short overview or hints to the contents of this data set.

• xml:lang (introduced with version 2.1): This is a unique identifier of language. It uses basically the language standard IETF BCP 47 (external link) which may be different to ISO 639-1 (external link) or ISO 639-2 (external link). For mapping hints see relation to other standards (external link).
  This is used for defining name and description.

• pos: This is the position on a track defined as distance from its start (trackBegin) regardless the "absolute mileage" in @absPos.
  Das ist die Position des Elements auf einem Track i.S. der realen Entfernung zum trackBegin. Sie ist damit unabhängig von der mit absPos modellierten Strecken-Kilometrierung.

🗒️ For an explanation of the differences between @pos and @absPos see <mileageChange>

• absPos: This is the position on a track as absolute mileage/chainage.
  Das ist die Position des Elements im Referenzsystem der Strecken-Kilometrierung.

🗒️ For an explanation of the differences between @pos and @absPos see <mileageChange>

• absPosOffset (deprecated with version 2.1): The semantics of this attribute aren't very clear. It seems to be redundant to the definitions with mileageChanges in "overlapping regions".

• dir: This defines the validity of <derailer> along the track. Possible values are:

• none: <derailer> has no direction restriction.
• up: This denotes the direction from the <trackBegin> to the <trackEnd> (increasing relative position values).
• down: This goes opposite to up (decreasing relative position values).
• both: <derailer> is valid in both directions.
• unknown: <derailer> is restricted to a certain direction, but this direction is not known.

• ruleCode: Code for this element in the rule book, combination of letters and numbers and space allowed, e.g. Ne5, GA, SFRS/E
• derailSide: Side, to which the vehicle will be derailed (left or right) considering the orientation of the track.

• kind: kind of derail device (cp. book "Railway Signalling and Interlocking" by Gregor Theeg and Sergej Vlasenko (Editors), p. 155)

• model: specification of the derailer

Syntactic Constraints / Syntaktische Beschränkungen

• id: xs:ID, required
  a string, starting with a letter (a..zA..Z) or an underscore (_),
  followed by a non-colonized and non-spaced string consisting of letters, digits, points (.), dashes (-) or underscores (_)
• code: xs:string, optional
• name: xs:string, optional
• description: xs:string, optional
• xml:lang: xs:language, language identification, optional

• pos: tLengthM (xs:decimal, 6 fraction digits, length value measured in meter); required; must be greater than or equal to zero, less than or equal to the track's length
  
• absPos: tLengthM (xs:decimal, 6 fraction digits, length value measured in meter); optional
  
• absPosOffset: xs:decimal, 6 fraction digits, length value measured in meter; optional

• dir: xs:string, generic type for more constrained direction statements: enumeration up, down, unknown; derived from tLaxDirection; optional
  
• ruleCode: xs:string
• derailSide optional

• kind optional

• model xs:string, optional

Best practice & Examples / Empfohlene Anwendung & Beispiele

Not yet described. / Noch nicht beschrieben.

Notes / Anmerkungen

General information on positioning

Positive pos values describe the distance from the track's begin. The track length is derived from the pos value in <trackEnd>.

The absolute mileage refered to by absPos is usually found on technical drawings of the track layout or on mileage posts next to the track.

Open issues / Offene Punkte/Pendenzen

Not yet described. / Noch nicht beschrieben.