▁ 4 - 4 - 0 ▁passenger ▁engines ▁of ▁the ▁' D ' ▁and ▁' E ' ▁classes . ▁His ▁tank ▁engines ▁built ▁at ▁the ▁works ▁included ▁the ▁vers atile ▁and ▁long - l ived ▁ 0 - 4 - 4 ▁' H ' ▁class , ▁the ▁larger ▁ 0 - 6 - 4 ▁' J ' ▁class ▁and ▁the ▁dimin utive ▁ 0 - 6 - 0 ▁tank ▁engines ▁of ▁the ▁' P ' ▁class . ▁W ain w right ▁was ▁followed ▁by ▁R . E . L . Ma uns ell , ▁who ▁introduced ▁the ▁ultimately ▁un success ful ▁' K ' ▁class ▁ 2 - 6 - 4 ▁mixed ▁traffic ▁tank ▁locomot ives ▁( which ▁were ▁later ▁re built ▁into ▁ 2 - 6 - 0 ▁tender ▁locomot ives ), ▁and ▁the ▁useful ▁' N ' ▁class ▁ 2 - 6 - 0 ▁mixed ▁traffic ▁locomot ives ▁in ▁ 1 9 1 7 . ▁ ▁However , ▁more ▁of ▁the ▁' N ' ▁class ▁locomot ives ▁were ▁produced ▁at ▁the ▁works , ▁and ▁parts ▁for ▁' K ' ▁class ▁loc os ▁that ▁were ▁assemble d ▁by ▁Arm strong ▁Whit worth ▁of ▁New castle ▁upon ▁Ty ne . ▁In ▁ 1 9 4 2 ▁the ▁works ▁also ▁built ▁twenty ▁of ▁the ▁Bul leid ▁' Q 1 ' ▁class ▁ 0 - 6 - 0 , ▁the ▁remainder ▁being ▁built ▁at ▁Bright on ▁Works . ▁During ▁the ▁later ▁war ▁years ▁the ▁works ▁also ▁built ▁a ▁number ▁of ▁the ▁L MS ▁ 8