[out:xml][timeout:3600]; ( way(1222371143)['operator:wikidata'='Union Pacific Railroad']; ); (._;>;); out meta qt;//['malformed secondary wikidata tag - for operator prefixed tags']
JOSM Wikipedia plugin
Note to self: online version hosted at https://matkoniecz.github.io/OSM-wikipedia-tag-validator-reports, files are stored at https://github.com/matkoniecz/OSM-wikipedia-tag-validator-reports.