The German use of railway=light_rail for S-Bahn is a bit peculiar, since it is generally operated with "heavy" rail equipment (often loco&coaches), to mainline signalling standards (which tend to be defined in terms of the stopping distance for a heavy freight train), and with heavy rail structures and clearances. There probably needs to be a term for railways that largely operate independently of the the mainline network, but are heavy-rail in technical terms (and may get used as diversionary routes for long-distance trains, during engineering works, and for excursions etc).
railway=suburban would be a possibility (or as an intermediate step, to let data-users adjust, railway_type=suburban)
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