old_contents: collections_to_resource_type = {
      "stop_points": "stop_point", "routes": "route",
      "networks": "network", "commercial_modes": "commercial_mode",
      "physical_modes": "physical_mode", "companies": "company",
      "stop_areas": "stop_area", "lines": "line",
      "addresses": "address", "coords": "coord",
      "journey_pattern_points": "journey_pattern_point",
      "pois": "poi", "poi_types": "poi_type",
      "connections": "connection"}
  
  resource_type_to_collection = dict((resource_type, collection)
                                     for (collection, resource_type)
                                     in collections_to_resource_type.iteritems())
  
new_contents: collections_to_resource_type = {
      "stop_points": "stop_point", "routes": "route",
      "networks": "network", "commercial_modes": "commercial_mode",
      "physical_modes": "physical_mode", "companies": "company",
      "stop_areas": "stop_area", "lines": "line",
      "addresses": "address", "coords": "coord",
      "journey_pattern_points": "journey_pattern_point",
      "pois": "poi", "poi_types": "poi_type",
      "connections": "connection", "vehicle_journeys":"vehicle_journey"}
  
  resource_type_to_collection = dict((resource_type, collection)
                                     for (collection, resource_type)
                                     in collections_to_resource_type.iteritems())
  
subject: add vehicle journeys to collections