Ai! Lá polin saca i quettar!
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A word appearing as rasg “wain” in a discussion of Elvish names for “Stonewain Valley”, more specifically “a drag or any large, flat vehicle on wheels or rollers for hauling stone or other weighty material” (PE17/28). In this instance it is probably derived from ✱raskā and has a plural form resg, with *sk* become *sg* as is usual in Sindarin.
It had the plural form raich in Imrath Gondraich, another name for “Stonewain Valley” appearing in the index to The Unfinished Tales (UTI/Stonewain Valley). This is probably the plural of an unattested variant ✱rach, which can be explained as a derivative of primitive ✱raksā with *ks* > *ch*; compare ach “neck” < aks (PE17/92).
There is a third plural form regain appearing in another variant name Tum Gondregain “Stonewain Valley” in notes from 1968 (NM/363). Assuming there is no error in the name, this plural is hard to explain, but it could have the plural suffix -in seen in words like conin “princes”.