I have several Lionel LionChief locos (mostly of the Thomas series) on my layout for use by my two great-grandsons and visiting kids. I applied 2x2-inch VELCRO strips to the fascia and to the backs of each controller -- a strong enough "grip" to hold the controllers in place - ready for use; yet easy for kids to remove and replace.
Mike Mottler LCCA 12394