In common with many more urban trolley systems , the H&F owned .
In common with many more urban trolley systems , the H&F operated two amusement parks , both as business ventures in their own right , and as traffic generators for the trolley business .
In common with many more urban trolley systems , the H&F owned and operated two amusement parks , both as business ventures in their own right , and as traffic generators for the trolley business .