Part 34 – Drawings for Stirling Engines

The Maurice Boddy Collection

Stirling was Locomotive Engineer on the GNR for almost 30 years, which saw dramatic changes, yet certain basic feature persisted, notably domeless boilers, and the “clean line” appearance of his machines.

Stirling boiler barrels had 3 concentric rings, tapering down towards the smokebox. In general, Ivatt boilers had two concentric rings, but not always tapering down towards the smokebox.  Stirling boilers were without domes, and Ivatt introduced domes early in 1896.

This Appendix covers selected Doncaster Drawings for Stirling engines, notably Smokebox (I), Valve and Reversing Gear (K), Boilers (M), Boilers (N), Frames (O), general Plans (P/Q), Connecting & Coupling Rods (S), Wheels (T), Brass fittings (W).  Several batches of engines were built by outside contractors, hence the apparent absence of certain drawings.  Certain Stirling rebuilds of Sturrock engines have also been included, as part of the evolution process. Details have been extended after 1896, in particular covering the changes Ivatt rapidly made to Stirling’s last boiler, which became Ivatt’s 4ft. 5in. diameter “standard” domed boiler.

Where possible the wording in the drawing register is given in the last column, as exact as is possible as not all pages in the drawing registers have been found. Occasionally the only source is a typed copy made some 60 years ago, in which errors have been found, in particular the original wording for Boiler drawings N1 to N32 is not known.  However for the general Plan drawings (P and Q), a more meaningful description has been given.

My notes appear within square brackets.  For further details, see Groves’ “GREAT NORTHERN LOCOMOTIVE HISTORY“, Volume 2.

Dwg. Nos Date Cylinders diam. X stroke Boiler barrel length Barrel diam (max.) Firebox casing length Engine Nos., Remarks
O1 26/5/1864         Frame for nos. 400 to 419 [See Appendix S]
O3 2/12/1864         Frame for pass tank engs 241to 250   [See Appendix S]
M19 4/12/1866 17″ x 24″       17″ x 24″ Cyls
T21 6/12/1866         5′-0″ Wheel and Axle for coupld Goods 474 to 493
O4 1/1867         Frame for 6 wheels goods 474-493
S10 16/1/1867         Coupling Rods 474 to 493
P16 3/1867 17″ x 24″ 10′-0″ 4′-0½” 5′-6″ 5ft. wheels 0-6-0 Nos. 474-93
I23 13/3/1867         Smokebox arrangement for Nos. 474 to 493
N27/1 26/3/1868         Boiler Goods and Passenger Engs
M19 4/12/1866 17″ x 24″       17″ x 24″ cylr
O5 1/1867         Frame for 4 wheels coupld pass 280-299
S11 18/1/1867         Coupling Rods for 280 to 299
Q17 10/5/1867         Arrangement of mountings &c on firebox 280-99
I26 10/1867         Smokebox for Nos. 280 to 299
Q21 7/1869 17″ x 24″ 10′-2″ 4′-0½” 5′-6″ 6ft-6in wheels 2-4-0 Nos. 280 to 299
M19 4/12/1866 17″ x 24″       17″ x 24″ cylr
O6 3/1867         Frame for 4 wheels coupld pass 18.23.40
Q18 8/1867 17″ x 24″ 10′-0″ 4′-0½” 5′-6″ 5ft-6in wheels 0-4-2 Nos. 18, 23, 40 &c
N27/1 26/3/1868         Boiler Goods and Passenger Engs
M19 4/12/1866 17″ x 24″ 10′-2″ 4′-0½” 5′-6″ 17″ x 24″ cylr
O7 7/1867         Frames for 7′ Single passr 4.6.21.41.55.61.222
N27/2    –         Boiler Goods and Passenger Engs
Q19 1/1868 17″ x 24″       7ft wheels 2-2-2 Nos. 6 &c
O8 4/1868         Frame for 4 wheels coupld pass tank 125. 126. 127
I27 13/3/1868         Smokebox forPassr tank Engine. 126 &c
Q20 9/1868 17″ x 24″ 10′-0″ 4′-0½” 4′-10″ 5ft 6in wheels 0-4-2WT Nos. 125, 126, 127 &c
M27 21/5/1868 15″ x 24″ 10′-0″ 4′-0½” 4′-10″ for Coupled Pass. No 218 & 220
O9 6/1868         Frame for 4 wheels coupld Passr tank 11. 218. 220. 31
N29 26/6/1868         0-4-2 Nos. 218/20, 11, 31
O10 11/1868 17″ x 24″ 10′-0″ 4′-0½” 5′-6″ Frame for 6 wheel coupld goods 369.377.184
M30 26/11/1868 16″ x 22″       16″ x 22″ cylinders  No. 396
N38    –         Boiler for 396. (Tracing on cloth) 4ft Wheels
P18 12/1868 16″ x 22″ 10′-0″ 4′-0½” 4′-2″ 4ft wheels 0-6-0ST Nos. 396 &c. See later
O11 10/1869         Frames for 4 Wheel coupld Passr 70 [See Appendix S]
M34 6/11/1869         Slide Valve and Buckle, Dawes’ Patent, No. 70
Q22 3/1870 16″ x 24″ 10′-0″ 4′-0½” 5′-4″ Sturrock 6ft wheels 2-2-2 No. 70, rebuilt as 0-4-2 [5/1870]
N34 9/12/1869         Boiler for 8 ft Pass Engine No 1 firebox casing 1in. narrower
M33 14/12/1869 18″ x 28″       18″ x 28″ Cylinders No 1
O13 24/12/1869         Bogie Frame for 8ft Wheel Passenger Engine
O12 1/1870         Frame for 8ft Wheel Pass Eng No 1
Q24 3/1870 18″ x 28″ 11′-5″ 4′-0½” 5′-6″ 8ft wheels 4-2-2 Nos. 1 &c
O17 4/1872         Frames for bogie wheels for 4-2-2 No. 5 [8/1873], &c
N35 –         Fire box with Midfeather for Passr Engines No 8.33
Q- /1870 18″ x 28″ 11′-5″ 4′-0½” 6′-2″ 8ft wheels 4-2-2 Nos. 8, 33, with mid-feather
O14 1/1870 17″ x 24″ 10′-6″ 4′-0½” 5′-6″ Frame for 7′-6″ Pass Engine No. 92
Q23 3/1870         7ft-6in wheels 2-2-2 No. 92
M36 4/8/1870 19″ x 28″       19″ x 28″ Cylinders for Goods Engs
S14 30/6/1871         Connecting Rod  5′-0″ Goods 19″ x 28″
O15 7/1871         Frames for 5′-0″ Goods Cylr 19 x 28
K23 15/8/1871         Reversing Screw 19″ x 28″ Goods Engs.
I33 26/9/1871         Smokebox for Goods engines 19″ x 28″
P20 11/1871 19″ x 28″ 11′-8″ 4′-5″ 6′-2″ 5ft wheels 0-6-0 Nos. 174 &c, with large boilers
N36 26/6/1872         Boiler for Goods Engines Cylr 19″ x 28″
Q26 1/1872 17½” x 24″ 9′-10″ 4′-0½” 4′-6″ 5ft-6in wheels 0-4-4BT Nos. 120 &c
O16 5/12/1871         Frame for 5′-6″ Pass. Tanks (Bogies)
Q27 5/1872 16″ x 24″ 9′-4½” 4′-0½” 4′-5″* 5ft-6in wheels 0-4-2T Nos. 10, 20, 42 & 43 * firebox casing width 3′-11½”, instead of usual 4′-0½”
K27 13/11/1872         Screw Reversing Gear. (Pass. Tanks) Nos. 10, 20, 42 & 43 [according to Groves]
M40 20/5/1872 17½” x 26″       Cylinders (No. 11 Patt) for Goods Engs. [0-6-0 No. 372 (4/1874)]
M42 25/5/1872 17½” x 24″       Cylinders (No. 14 Pattern) for 4 W.C. Engs [presumed 0-4-2]
P23 12/1873 17½” x 26″ 10′-1″ 4′-0½” 5′-6″ 4ft-6in 0-6-0ST Nos. 494-99 &c
T47 16/10/1873         4′-0″ Wheels and Axles for 6 W.C. Tanks 396, 470-1
N38 [blank]         Boiler for 396 (Tracing on cloth) 4ft. Wheels [No further details have survived, but the engine may have been brought into line with the four further engines built in 1874 (Nos. 136/7/8, 399)]
N39 8/6/1875         Boiler 5′-6″ Passenger Engines – Standd
P24 7/1875         5ft-6in wheels 0-4-2 possibly No. 551 &c to No. 66
O2 2/5/1878         Frame for 4 WheelCoupld 5ft-6in Engine
O18 8/1875         Bogie Frame for Tank Engines 5’/6″ Pass [0-4-4BT possibly from No. 532]
Q40 2/1876         5/0 Pass Tank Engs Nos. 501-2-3
M43 10/2/1876 16″ x 22″       Cylinders (No. 20 Patt.) for Nos 501 and 502 [0-4-2ST]
N-      9′-3″ 4′-0½” 4′-6″ [Boiler details from Engine Diagram, per Groves]
O19 3/1876         Frame for Pass. Tank Engines 5’/0″ Wheels 4 Coupld
K35 9/3/1876         Valve Gear Details for Nos. 501 & 502
O20 4/8/1876 18″ x 28″ 11′-5″ 4′-0½” 6′-2″ Frame for Pass Eng. 8ft. 69 & 98
O21 8/10/1878         Cradle for Bogie Tank Eng. frames
O22 28/6/1879 17½” x 26″ 10′-1″ 4′-2½” 5′-6″ Frame for 6 wheels coupld Goods Engines 17½ x26  [0-6-0 No. 168 (new 8/1879) &c, with 4′-2½” diam. boilers]
O23 25/9/1879 17½” x 26″ 10′-1″ 4′-2½” 5′-6″ Frame for 6 wheel coupld Goods Engs 17½ x26 [The almost identical wording is not understood, and cannot be checked. Perhaps a problem was found on No.168 when new]
N40/1 21/1/1879   10′-0″ 4′-0½” 4′-6″ Boiler for [Sturrock] Passenger Tank Engs. Nos. 241 to 250,270 &c
N40/2 ?   10′-0″ 4′-5″ 4′-6″ [possibly reissued c.1894 for larger diameter replacement boilers]
O24 11/1879         Frame for Shunting Tank Engs Nos 634 to 639
P28 3/1880 17½” x 26″ 10′-1″ 4′-0½” 5′-6″ 4ft-6in wheels 0-6-0ST Nos. 634-9 [new 1880] &c, longer frames
N41 11/7/1879         Boiler for 8ft Passenger  Engs
Q6 31/7/1880 19″ x 28″ 11′-5″ 4′-2″ 6′-2″ 8ft wheels 4-2-2 Nos. 662-71 [new 1881-83]
I34 22/7/1879         Tee-piece for exhaust pipe, Engine No. 99 [new 10/1879]
N42/2 18/8/1879   10′-2″ 4′-5″ 5′-6″ Boiler for 4-wheels coupled, 6ft-6in engine (proposal)
N43 9/1881   10′-2″ 4′-2½” 5′-6″          replacement dwg. ***
I35 9/10/1879         Smokebox arrangement for engine, 17½” x 26″ cyls.
O25 1/1880         Frame for 6′-6″Passr Engs Nos 97 and 223 [new 9/ & 7/1880]
Q3 10/2/1880 17½” x 26″       6′-6″Passr Engs Four coupld 17½” x 26″ 4′-3″ [sic] Boiler [presumably 4′-3″ diam. over smallest ring]
N2 -/1880 17½” x 24″ 9′-10″ 4′-2½” 4′-6″ 0-4-4BT No. 120 &c, larger boilers
N3 4/1880 17½” x 24″ 10′-2″ 4′-2½” 5′-6″ 2-4-0 No. 284 [3/1880], 2-2-2 No. 6 [5/1880], &c larger boilers
O26 23/2/1880         Frame for Bogies for Passr Tank engines
O27 28/12/1880         Frame for Passr Tank engine with 5ft wheels, 0-4-4T Nos.
Q12 2/1881 17½” x 24″ 10′-0″ 4′-0½” 5′-6″ general Plan outside elevation
Q7 3/1881         general Plan
K37 22/2/1881         Screw Reversing Gear Nos. 658 to 661
K39 6/1881         Valve Spindle Guide Nos. 658 to 661
O28 27/7/1881 16″ x 24″ 10′-0″ 4′-0½” 4′-10″ Outside frame for [Sturrock 0-6-0ST] Nos. 111 &c reboilered
K40 6/1881         Cross Stay for Valve Spindle Guide for 6′-6″ Pass. Engs [Groves says from No. 78]
N43 1/9/1881 17½” x 26″ 10′-2″ 4′-2½” 5′-6″ 2-4-0s reboilered [presumed specifically for those with 26″ stroke cylrs.]
N44/1 7/1882 17½” x 26″ 10′-1″ 4′-0½” 5′-6″ Boiler for Six Coupled Saddle Tank Engines
P33 1/1883         4ft-6in wheels 0-6-0ST Nos. 494 &c
N44/2 /1891 17½” x 26″ 10′-1″ 4′-0½” 5′-6″ 0-6-0ST Nos. 494 &c
O29 21/6/1882         Frame for Saddle Tank Engs Nos 156 & 385 [new 1882, later 684/5]
P30 6/1882 17″ x 24″ 10′-0″ 4′-0½” 5′-6″ 4ft wheels 0-6-0ST No. 684 (new 12/1882) &c, Blackwall traffic
N45 10/1882         Boiler for Six coupld Tank. Nos 686 & 687 [new 1884]
O30 7/7/1882         Frames for Goods Engines with 4′-6″ Wheels
P32 12/1882 17½” x 26″ 10′-1″ 4′-2½” 5′-6″ 4ft-6in wheels 0-6-0 No. 374 [new 8/1883] &c
Q42 1/1883 17½” x 24″ 10′-0″ 4′-0½” 5′-6″ 5ft wheels 0-4-4T Nos. 694-8 [new 1884]
O31 21/8/1883         Frame for Bogie Tank Engines Nos. 694 to 698
K44 9/8/1883         Valve Spindle Guide Nos. 695 to 698
K45 21/8/1883         Valve Gear for                ditto
K46 29/8/1883         Reversing Gear for        ditto
T64 22/10/1884         7′-6″ wheel & axle for NewPassr Engs Nos. 1000 & 1001
T65 31/10/1884         4′-0″ Leading & Trailing for ditto
O32 31/10/1884         Frame for 7′-6″Passr Engs Nos. 1000
K48 12/1884          
K49 13/2/1885          
Q44 1/7/1886 18½” x 26″ 10′-0″ 4′-2″ 5′-10″ & 1001 232, 238 Valve gear for 7′-6″ Pass. Engs Reversing Gear for ditto 7ft-6in wheels 2-2-2 Nos. 232 (new 8/1885), 238 (new 6/1885)
T60 12/1882         7′-6″ Wheel for No. 92 Engine [2-2-2 No. 92 rebuilt 1883]
M47 4/9/1884 18½” x 26″       18½” x 26″ cylinders for 7′-6″ Pass. Engs
N51/2 6/10/1884         Boiler for 7′-6″ New Passr Eng.
O33 17/8/1885         Frame for 7′-6″Passr Engs Nos. 1002, 1003 234, 229
Q45 1/1886 18½” x 26″ 11′-5″ 4′-2″ 6′-2″ 7ft-6in wheels 2-2-2 Nos. 1002, 1003, 234, 229 &c, large boilers
N46/1 -/1882 17½” x 26″ 10′-1″ 4′-0½” 5′-6″ 0-6-0ST Nos. 688-93 [new 1883] &c
N46/2 -/1883 17½” x 24″ 10′-1″ 4′-0½” 4′-10″ 0-6-0ST Nos. 606-15 [new 1876-77], shorter frame, ? new boilers
N47 18/1/1884 17½” x 26″ 10′-1″ 4′-2½” 5′-6″ 5ft wheel 0-6-0 No. 171 &c, original frames, larger boilers
N48 30/1/1884 17½” x 26″ 10′-2″ 4′-2½” 5′-6″  
O34 11/1/1886         Frame for 6′-6″Passr Engs [2-4-0 No. 206 &c]
M50 25/8/1888         No. 11 Patt. for 6′-6″ Pass. Engs
N49 27/2/1884 18″ x 28″ 11′-5″ 4′-2″ 6′-2″ 4-2-2 with strengthened frames
N50 18/3/1884 17½” x 24″ 10′-0″ 4′-2½” 4′-10″ 0-4-2WT Nos. 131/2 &c, reboilered
N52 30/10/1884 17½” x 24″ 10′-2″ 4′-2″ 5′-6″ Sturrock 2-2-2 rebuilds Nos. 264-9 [boiler dimensions taken from Groves book]
N53 6/2/1885     4′-2½”   Sturrock 2-4-0 No. 255 [2/1885] &c reboilered [Boiler dimensions not survived]
N54 9/7/1885   10′-1″ 4′-2½” 5′-6″ 0-6-0 5′-1½” wheels cyls 17½” x 26″, No. 791 &c
O36 3/1886         Frame for Six Wheels Coupled Goods Engines (Nos. 791 to 800) [Frames extended to provide room for 21″ vacuum cylinder Therefore, No. 791 (not 322) was the first with longer frames]
O35 3/1886 17½” x 26″ 10′-1″ 4′-0½” 5′-6″ Frame for Shunting Tank Engs Cylrs 17½” x 26″, Nos. 783 to 790
T67 11/1885         8′-0″ Wheel & Axle forPassr Eng. (Steel)
O37 10/6/1886         Frame for 8ft.Passr Engines
Q47 1/1888 18″ x 28″ 11′-5″ 4′-2″ 6′-2″ general Plan, 8ft. wheels 4-2-2 Nos. 775-78 [new 1885-87]&c
Q48 20/2/1888         outside elevation
N55 -/1886 17½” x 24″ 9′-10″ 4′-5″ 4′-6″ 4′-5″ Boiler for Metropolitan Bogie Tank Engs to replace old Boilers 4′-0½” Diar [0-4-4BT Nos. 120 &c]
N56 10/12/1886 16″ x 24″ 10′-0″ 4′-2½” 5′-6″ Sturrock 0-6-0s Nos. 360 [1/1887], 364 [7/1888] &c, reboilered
T71 3/1889         5′-6″ Wheel (Wrt Iron) for Passr Side Tank Eng. Nos. 766 to 770
N57 3/1889         4′-2½” Boiler for Met. Side Tank Engs Nos 766 to 774
M51 5/4/1889 18″ x 26″       Cylinders (No. 21 Patt) Met. Side Tanks
K50 1/5/1889         Valve Gear Details for 5′-6″ Met. Side Tanks Nos. 766 to 770
O38 4/1889         Frame for Met Bogie Side Tank Engs 766 to 770
Q49 20/5/1889 18″ x 26″ 10′-1″ 4′-2½” 5′-6″ 5ft-6in wheels 0-4-4T Nos. 766-70, 821-5 [new 1889-90]
T72 12/1889         4ft Steel Wheel for 6 Wheels Coupld Tank Engs [Nos. 134/40/4/9]
M53 8/1890 17½” x 26″       for 6′-6″ Engs [No. 861 (4/1891) &c, twin cylinder casting, Pattern No. 22]
W38 7/2/1891         Regulator for engines fitted with Twin Cylinders [Pattern] No. 22
O39 1/1892         Alteration to Frame  – Metn Side Tank Engs 931 to 940
Q50 4/1892 18″ x 26″ 10′-1″ 4′-2½” 5′-6″ 5ft-6in wheels 0-4-4T Nos. 931-40 [new 1892-93]
P35 1/1892 17½” x 26″ 10′-6″ 4′-2½” 5′-6″ 4ft-6in wheels 0-6-0ST Nos. 921-6 [new 1892-93] &c
O40 2/1892         Frame for Saddle Tank Engs – 10 6 Barrel 4-6 Wheel 17″ x 26″ Cylrs
K51 9/5/1892         Valve Gear Details 4′-6″ Saddle Tanks No. 921 to 926
N60 30/7/1892         Boiler for 6WC Tank Eng 10′-6″ barrel Nos 921 to 926
N61 11/1892 19″ x 28″ 11′-4″ 4′-5″ 6′-2″ 0-6-0 No. 174 &c, larger boilers
N62 12/1892 17½” x 24″ 9′-10″ 4′-0½” 4′-10″ 0-6-0ST Nos. 395/8, 166/7, renewals
O41 13/5/1893 18″ x 26″ 10′-1″ 4′-2½” 5′-6″ Bogie for Metn Passr Tank Engs [moved further back, Nos. 941-4]
O44 11/1894         Frame for Metn Side Tank Engines Nos. 941 to 944 [0-4-4T]
L14 1/11/1893         Steel Crosshead for 7′-6″ Pass. Eng. [Nos. 876-80, 981] [The first reference to a steel crosshead]
T77 8/2/1894   11′-1″ 4′-2″ 6′-10″ 8′-0″ Wheel & Axle (Steel) for Nos. 1003, 1004 [&c]
M59 2/1894 19½” x 28″       4-2-2 Nos. 1003-8 cylinders
O42 13/3/1894         4-2-2 Nos. 1003-8 bogie
O43 4/4/1894         4-2-2 Nos. 1003-8 main frames 4″ longer then O37
N64 19/4/1894         4-2-2 Nos. 1003-8 boiler barrel 4″ shorter, firebox casing 8″ longer than N49
Q51 12/1894 19½” x 28″       General Plan
O45 11/1894         Frames for 4′-6″ Six Wheels Coupled Engs Nos. [1021 to 1026 added]
K57 20/12/1894         Screw Reversing Gear, 6 WC Goods Eng.
P36 12/1/1895 17½” x 26″ 10′-1″ 4′-5″ 5′-6″ 4ft-6in wheels 0-6-0 Nos. 1021-30, domeless [new 1896]
N65 15/1/1895         Boiler for Goods Engs with 4′-6″ Wheels – Nos. 1021 to 1026 [These had 3″ water legs]
N66 11/1895         Boiler for Goods Engs with 5′-0″ Wheels (Standd)
P37 11/1895 17½” x 26″ 10′-1″ 4′-2½” 5′-6″ 5ft wheels 0-6-0 Nos. 1031-45, domeless [new 1896]
M63 12/1895 17½” x 26″       17½” x 26″ Cylinders, 5′-0″ Goods
N67 2/1896         Arrangement of Tubes for Tank Engs Nos 1031 to 1045 Firebox end
N68 2/1896         ditto                    Smokebox end [Nos. 1031-45 were tender engines, having 4′-2½” diam barrels Nos. 1046-60 were tank engines, also having 4′-2½” barrels It is not known what was intended, and the dwgs. no longer exist]
N69 2/1896         Arrangement of Tubes for 8ft Engs Firebox end
N70 2/1896               ditto               Smokebox end
N72 2/1896   11′-3″ 4′-2″ 6′-8″ Boiler for 8ftPassr Engines barrel 2″ shorter, firebox casing 6″ longer than N49, dome fitted
N73 3/1896         Riveted joints for ditto
N74 3/1896         Dome cover for ditto
O- not made         Frames lengthened by 4″ to accommodate longer boiler [Fitted to Nos. 22, 34, 93/5, 221, 544, 776]
N71 18/2/1896   10′-1″ 4′-5″ 5′-6″ 4′-5″ Boiler for Standd 5′-0″ Goods engines [0-6-0 Nos. 1081-90, plus ten boilers for renewals, domeless] [These had 1¾” water legs]
N75 3/1896   10′-1″ 4′-5″ 5′-6″ Boiler for 5′-6″ coupld Eng (4′-5″ Barrel) [0-4-2 proposal with domed standard boiler]
N76 3/1896   10′-1″ 4′-5″ 5′-6″ Boiler for 6′-6″ coupld Eng (4′-5″ Barrel) 2-4-0 Nos. 1061-70, domed boiler [new 1897]
O46 18/5/1896 17½” x 26″       Frame for 6′-6″ passenger engines [Nos. 1061-1070 added]
N77 7/1896   10′-1″ 4′-5″ 5′-6″ Standd Boiler for Goods & Passr Engines [domed] [Barrel made of 2 rings instead of 3] [No. 400, new 12/1896, onwards]
N78 8/1896         Bottom of corners of Firebox for  ditto
N79 1/10/1896         Dome Cover for 4′-5″ Boiler (Standd)
N85 3/1898   10′-1″ 4′-5″ 4′-10″ Dome version of N50, 2 barrel rings, BO512 30/3/1898, 10 boilers 0-4-2WT 118 &c, 0-4-4BT 652 &c
N88 /1898   11′-5″ 4′-2″ 6′-2″ Dome version of N51, 2 barrel rings instead of 3, for 2-2-2s [Engines 233/40, 871/73/76]
N119 20/02/1902   11′-5″ 4′-2″ 6′-2″ For 8ft pass. eng. 7ft-6in singles. (Based on N48, amendment made too late to be based on N51) Dome added as afterthought. [But first used for 0-8-2T No. 116]
N132 /1903   11′-5″ 4′-2″ 6′-2″ Based on N88, but dome 1′-3″ further back. [Used for 0-8-2T Nos. 117 &c]
N262 Aug-13   10′-6″ 4′-2″ 6′-2″ N132 altered for new Gresley 0-6-0T Nos. 157 &c
N-? Jun-02   10′-1″ 4′-2½” 5′-6″ BO548 20/6/1902, 5 boilers
N181 09/01/1908         BO583 16/12/1907, 6 boilers
N209 ?         BO605 23/10/1911, 5 boilers Domed version, 3 barrel rings, Classes G1 and G3, also appeared in Class J15

 

*** dwg. N43 noted as “Boiler 4′-0½” & 4′-2½” for 6′-8″ Passr Engines”, i.e. quoting minimum and maximum diameters