A magazine connected with (Boy) Scouting, possibly "Boys Life", in the early 1950's ran a short story in which a group of interplanetary explorers on an extraterrestrial planet, which may have been postulated to have a breathable atmosphere, encountered a functional alien transport designed to travel across rough terrain.
The machine was half hidden or buried when a member of the team discovered it and when he reported back was asked to "roll it out." He replied, "It, 'er, walks."
The alien inventors turned out to be long gone. The machine resembled a large multi-legged insect. There may have been a drawing accompanying the story.
The link I'm attempting to add here may not work, but if it does it's the only source to the Boy's Life image of the alien walking machine that's currently accessible. Boy's Life issues from 1950 are not to be found. If the link works, open Boy's Life November 1950 issue and scroll down to page 21.