, ▁J . A . ▁Ma ff ei ▁and ▁North ▁British ▁Lo comot ive ▁Company . ▁ ▁Other ▁locomot ives ▁which ▁were ▁delivered ▁new ▁with ▁Type ▁MP 1 ▁tend ers ▁were ▁the ▁Class es ▁ 1 4 , ▁MC 1 , ▁M H ▁and ▁M J . ▁ ▁Reb u ild ing ▁During ▁the ▁ 1 9 3 0 s , ▁several ▁of ▁the ▁Type ▁MP 1 ▁tend ers ▁were ▁re built ▁by ▁the ▁S AR ▁by ▁mount ing ▁a ▁completely ▁new ▁upper ▁structure ▁with ▁a ▁larger ▁water ▁tank ▁on ▁the ▁existing ▁under frame . ▁The ▁modification ▁was ▁done ▁to ▁draw ings ▁approved ▁by ▁Chief ▁Mechan ical ▁Engine er ▁( C ME ) ▁A . G . ▁Watson ▁in ▁ 1 9 2 9 ▁in ▁respect ▁of ▁Type ▁MP 1 ▁tend ers ▁of ▁the ▁Class es ▁ 1 2 , ▁ 1 2 A , ▁ 1 2 B , ▁ 1 4 , ▁ 1 4 A , ▁ 1 4 B , ▁ 1 5 , ▁ 1 5 A , ▁ 1 6 , ▁ 1 6 A , ▁ 1 6 B ▁and ▁ 1 6 C . ▁These ▁re built ▁tend ers ▁had ▁a ▁more ▁modern ▁appearance , ▁with ▁flush ▁sides ▁all ▁the ▁way ▁to ▁the ▁top ▁of ▁the ▁self - trim ming ▁coal ▁b unker . ▁ ▁The ▁program ▁to ▁re build ▁several ▁older ▁tender ▁types ▁with ▁new ▁upper ▁structures ▁was ▁begun ▁by ▁Col ▁F . R . ▁Collins ▁D SO , ▁who ▁approved ▁several ▁of ▁the