‘G’ scale is 1:22.5
Thus 1/25 scale cars, trucks and even accessories such as garage tool kits fit in so well. Though I myself have never dabbled in the train hobby, I have had many customers commission pieces and learned a lot through them.
Many are set up outside to run through gardens and back in for storage. A very expensive hobby, worthy of the tag “Big boys toys”.
Having said that, G scale doesn’t always work for our needs, the average car modeler, not if you are picky. Most items offered are 1/32 to 1/29 scale, all being labeled as G scale. So do your homework before purchasing.