Best way to glue HO automobiles to layouts?

[RobertInOntario]

Epoxy a small nut to the underside of the car, drill a small hole in the baseboard and screw a bolt in from underneath. Alternativey epoxy a bolt head to the underside of the car drill a hole and add a nut from underneath. Either method will allow you to use the vehicle again on another layout - the first will allow the car to be placed on a road later, whereas the bolt attached would prevent that

Thanks -- this sounds like a great idea!