Ok. So it is definitely not "disused"; it is at best "abandoned" but that would require that someone who is not a railway buff can see: Oh, apparently there used to be a railway here. The photo on https://wiki.openstreetmap.org/wiki/Tag:railway%3Dabandoned illustrates that quite well. If it is just "space next to the road" that leads someone with "an eye for the railways" to deduct that there must once have been a railway here, don't map it in OpenStreetMap. There is a project called "OpenHistoricalMap" that lets you map these things.