Read the sentence pairs. Choose the sentence that uses the underlined part correctly. 1. A The sand box helps the train stay on track in wet weather. B The driver operates the train from the main alternator . 2. A The system stays cool because of a turbocharger . B Power for heating each car comes from the auxiliary alternator . 3. A Radiators circulate cool air through the locomotive. B The fuel tank can hold up to 5,000 gallons. 4. A The handle for the brake is located on the control stand . B The motor blower gives power to the entire engine.