hi, it's good practice to try ad retain the history of existing features https://wiki.openstreetmap.org/wiki/Good_practice#Keep_the_history

So the preferences is to update what exists rather than delete and re-add them.

A number of railway lines here have been deleted only to be re-added at the same location when you could just update the tags.

For some of the deleted sections like https://pewu.github.io/osm-history/#/way/94893247 it would be better to update the tags to clarify what's there. We have a vast range of lifecycle prifex https://wiki.openstreetmap.org/wiki/Lifecycle_prefix. For example are the tracks still present but currently disused, are they razed or removed or destroyed? Even if they are completly gone, you could still keep them as was:railway while image still shows them otherwise other mappers map re-add them from imagery.