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Baldwin Loco Works official photo, Wb 297, 1898

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Wellington & Manawatu Railway Co Locomotive Classes

NZR Class N Ob Oa Na Oc Bc Nc Wj Ud
WMR Road No's 9,10 11,12 13 14,15 16 17 5,18 3 19,20
NZR Class N Ob Oa Na Oc Bc Nc Wj Ud
Wheel arrangement 2-6-2 2-8-0 2-8-0 2-6-2 2-8-0 2-8-2 2-6-2 2-8-4T 4-6-0
Date built 1891 1888 1894 1894, 1896 1896 1901 1901, 1904 1904 1904
Weights: (tons)
total 50.8 57.6 57.4 54.5 62.8 71.4 63.5 53.6 66.8
engine 31.8 38.5 38.4 35.4 41.8 45.4 39.7 53.6 39.4
adhesive 23.4 34.3 33.7 25.2 36.7 33.9 27.7 38.0 29.2
tender 19.0 19.1 19.0 19.1 21.0 26.0 23.8 - 27.4
length over buffers 50'2" 51'3" 51'8" 50'10" 51'8" 55'7" 54'10" 37'2" 51'6"
total wheelbase 42'0" 43'3" 43'7" 42'10" 43'7" 47'4" 44'7" 29'5" 44'4½"
engine wheelbase 23'2" 18'11" 19'2" 23'2" 19'2" 24'2" 21'1" 29'5" 21'2"
tender wheelbase 12'9" 12'10" 12'9" 12'9" 12'9" 12'6" 12'6" - 13'2"
coupled wheelbase 9'6" 12'3" 12'3" 10'1" 11'9" 11'9" 9'0" 11'9" 11'0"
driving wheel diameter 49" 43" 43" 49" 43" 43" 49" 43" 58"
cylinder diameter, low pressure - - 18" 17" 18" 19" 17" - -
cylinder diameter, high pressure 15" 16" 11" 10" 11" 11½" 10" 17" 16½"
cylinder stroke 20" 20" 20" 20" 20" 20" 20" 20" 22"
grate area, sq.ft 16.3 16.5 16.7 16.7 16.7 25.0 25.0 16.5 16.5
heating surface sq.ft 893 1013 1056 957 1038 1477 1091 1080 1095
working pressure, psi 140 165 180 180 200 200 180 200 185
tractive effort, @80% working pressure 10285 15717 13600 9700 15110 16080 9720 21510 15280
coal bunker capacity, tons 3.0 3.5 3.2 3.0 3.2 4 4.5 2.5 4.0
water tank capacity, gallons 1200 1500 1300 1500 1500 1660 1500 930 2000