rail:vehicles 

container for single vehicle data or vehicle family data

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

Element Information

Model

rail:vehicle+
Children: rail:vehicle

Source 

<xs:element name="vehicles" type="rail:eVehicles" minOccurs="0">
  <xs:annotation>
    <xs:documentation>container for single vehicle data or vehicle family data</xs:documentation>
    <xs:documentation source="http://wiki.railml.org/index.php?title=RS:vehicles"/>
  </xs:annotation>
</xs:element>

Sample