Sounds pretty cool. Cromby give me Nostrilia vibes, did you read that? I love "Racerbeast" it's a name that sounds awsome and a the same time is close enough to "Wildebeest, Hartebeest, ..." to sound plausible.
Regarding the writing, try to cut the slack a little: "the thing that kept Cromby's on the map" -> "What kept Comby's on the map", "something called molecular steam" -> "molecular steam" (you can put it in quotation marks if you want to emphasize that the narrator doesn't really know what it is), maybe even "stripped clean of anything valuable" -> "stripped clean", etc.
Minor issue: the first line doesn't quite work for me. In principle, the "more of a ..." is cool and adds a lot of flavor. But since the place is called "Cromby's Mine" it comes right after Mine so I read "Cromby's Mine, more of a village really." That gave me a pause (of course it's a village not a mine). If you don't want to confuse distracted people like me you have to do something to move "town" directly in front of that comma. "Cromby's mine, is hardly a town, more of a village really..."