Car hire rules 16 through 21, rule 23 and rule 24. Rule 16 is currently not used. Rule 17 outlines the arbitration process. Rule 18 delegates the EAC as responsible for informally interpreting car service and car hire rules. Rule 19 outlines the powers of the AAR's Business Services division. Rule 20 deals with cars on Canadian railways or Canadian-owned cars. Rule 21 deals with the reclaims on new cars assigned a Transportation Code D. Rule 23 allows for the reclaim of car hire paid on stored boxcars. Rule 24 allows carriers to assess a mileage charge for boxcars that are shipped home at the car mark owner's request.