Wiktionary
sandrail
n. (alternate form of sand rail English)
Wikipedia
Sandrail
A sandrail, or sand rail, or rail, is a lightweight off-road motor vehicle specifically built for traveling in sandy terrain. Similar in some respects but often mistakenly referred to as a dune buggy or sand car, a sandrail is a different type of speciality vehicle. Sandrails are popularly operated on actual sand dunes. Sandrails can be driven on other types of terrain but are designed specifically for sand.