I moved this thread to the Scanning Software forum.
RR frequencies are usually posted at the state level (for those used in each state). In your case, Ohio has them at the statewide level also. They are conventional frequencies and can be imported just like any other conventional frequency.
You will run into some error boxes on the way, but just go through them (not sure why they pop up, but at least the errors reported are false.) Choose: US, Ohio, Statewide in the drop-downs and then pick Railroads from the agency drop down.