It's a particularly confusing time in Maryland as it relates to ebikes. I don't live in MD, but I have ridden in the state and I have a good friend who's a state park manager. The state has always had restrictive ebike laws, the new 3 class law had gone a long way in fixing the regulations. The thing to remember is the 3 class law doesn't effect any "off road" path or trail. Since most towns in Maryland are unincorporated, the county is likely the government entity in control of access to the county parks department trails, but as I recall the Catonsville Rail Trail Authority is a private nonprofit corporation. They can be more complicated, we have them in PA too. Usually a public-private partnership, but they often retain authority over regulations.