User talk:Post-carbonRail

hydrail
Hi. This is attributive use of a noun. It's not an adjective any more than "tractor" in "tractor parts". Adjectives usually behave in certain ways, e.g. they are comparable ("how blue was it?"); this doesn't apply to hydrail and tractor. Equinox ◑ 23:02, 2 April 2014 (UTC)