rail:couplers 

data for couplers between wagons

http://wiki.railml.org/index.php?title=RS:couplers

Element Information

Model

rail:mechanicalCoupler* , rail:pneumaticCoupler* , rail:electricalCoupler*
Children: rail:electricalCoupler, rail:mechanicalCoupler, rail:pneumaticCoupler

Source 

<xs:element name="couplers" type="rail:eCouplers" minOccurs="0">
  <xs:annotation>
    <xs:documentation>data for couplers between wagons</xs:documentation>
    <xs:documentation source="http://wiki.railml.org/index.php?title=RS:couplers"/>
  </xs:annotation>
</xs:element>

Sample