Abandoned railways with no remnants on the ground should be deleted. See discussion on wiki https://wiki.openstreetmap.org/wiki/Tag:railway=abandoned.

They do not appear on osm-carto but they do appear on other renderers like OrganicMaps, especially the bridges.

https://www.openstreetmap.org/way/1159977294
https://www.openstreetmap.org/way/1159977293
https://www.openstreetmap.org/way/1159977292
and probably more.