. ▁ 1 6 3 4 , ▁which ▁was ▁also ▁modified ▁by ▁short ening ▁and ▁raising ▁the ▁sides ▁of ▁the ▁coal ▁b unker , ▁to ▁the ▁sole ▁Type ▁XP 1 ▁tender . ▁ ▁Reb u ild ing ▁to ▁Type ▁MR ▁During ▁the ▁ 1 9 3 0 s , ▁some ▁of ▁the ▁Type ▁MP 1 ▁tend ers ▁were ▁re built ▁by ▁the ▁S AR ▁by ▁mount ing ▁a ▁completely ▁new ▁upper ▁structure ▁on ▁the ▁existing ▁under frame . ▁The ▁modification ▁was ▁done ▁to ▁draw ings ▁approved ▁by ▁Chief ▁Mechan ical ▁Engine er ▁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 ▁new ▁tank ▁increased ▁the ▁water ▁capacity ▁from ▁ ▁and ▁these ▁re built ▁tend ers ▁were ▁therefore ▁rec lass ified ▁to ▁Type ▁MR . ▁ ▁Ill ustration ▁ ▁References ▁ ▁MP 1 <0x0A> </s> ▁Stanley ▁O wen ▁Jones ▁( 1 9 3 0 – 2 0 1 2 ) ▁was ▁a