These tenders carried much more coal and water than regular tenders, permitting locomotives such as No. 6755 to travel great distances without stopping. It was also equipped with a head end brakeman's "doghouse" and a train phone radio antenna.
Class 210F75B Tender
A variety of tenders were fitted to M1 locomotives, of steadily increasing size. During later years some hauled sixteen-wheel 210-F-75B tenders almost as long as the locomotives themselves.