Hi Lachlan,
Thanks for contributing to OSM.

In this changeset you've duplicated (19312176) the route_master relation for the Hurstbridge Line (1830850). Was this intentional? There doesn't need to be a new route_master for this line, the route variations can just be added to the old one. Also, route_master relations should not have nodes or ways in them, these should be removed.

https://www.openstreetmap.org/relation/19312176 (duplicated)
https://www.openstreetmap.org/relation/1830850 (original)

Feel free to check the wiki for guidance https://wiki.openstreetmap.org/wiki/Relation:route_master :)