Dear user syntex, the DWG has become aware of this dispute. Old railways are a frequent source of dispute among OSM mappers. One thing is absolutely clear: When railway tracks have been built over and no trace remains, they will not be mapped in OSM. This is not a matter of preference - this is community consensus. So please do not revert changes where someone removes such over-built railways from OSM. 

Railway lines that are still clearly visible, even when the tracks have been removed, may be mapped as "razed" but regional communities differ in how they handle this (how much exactly must still be visible for this mapping to occur). If your dispute is about such kinds of railways (that are not built-over and at least to a trained eye clearly discernible as former railway lines) then please establish a consensus in a suitable community medium (e.g. the new forum) before continuing. 

But I repeat - if the railway line has been built over then there is no place for it in OSM any more, full stop. If you re-instate such railway lines where others remove them for good reason, the edits will be reverted and your account blocked.

This matter is tracked in DWG's issue tracker as Ticket#2023041610000071.