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Part of a steam locomotive
A smokebox is one of the major basic parts of a steam locomotive exhaust system. Smoke and hot gases pass from the firebox through tubes where they pass
Smokebox
Railway locomotive powered by a steam engine
the chimney in the smokebox. The steam entrains or drags the smokebox gases with it which maintains a lower pressure in the smokebox than that under the
Steam_locomotive
exhaust system that discharges exhaust steam from the cylinders into the smokebox beneath the chimney in order to increase the draught through the fire.
Glossary_of_boiler_terms
Type of boiler
flow of flue gas through the firetubes is from back to front. An enclosed smokebox covering the front of these tubes leads upwards to the chimney or funnel
Fire-tube_boiler
Vertical plates attached to steam locomotives
in US railway slang, are vertical plates attached to each side of the smokebox at the front of a steam locomotive. They are designed to lift smoke away
Smoke_deflectors
Class of American 4-6-2 locomotives
modified with a smokebox extension and a different feedwater heater within. 5698 was again modified by 1948 with a new (one-piece) smokebox, new cylinders
Pennsylvania Railroad class K5
Pennsylvania_Railroad_class_K5
Steam locomotive which carries its fuel and water onboard
uninsulated smokebox. 0-6-0. The saddle tank is in a firebox with a smokebox A typical curved-shaped saddle tank, covering both firebox and smokebox A Hunslet
Tank_locomotive
Steam locomotive boiler
flowing out of the main chimney via the smokebox. Once the boiler is producing steam, the exit from the smokebox into the main chimney is closed and the
Franco-Crosti_boiler
Prototype dual cab steam locomotive
outputs, a situation made worse by the narrowing of the firebox area. The smokebox had an inherent problem in maintaining a constant vacuum. This was a result
SR_Leader_class
Component of a steam locomotive's exhaust system
steam locomotive that discharges exhaust steam from the cylinders into the smokebox beneath the chimney in order to increase the draught through the fire.
Blastpipe
Early engine which could be easily moved between work sites
reversed, with the cylinders at the firebox end and the crankshaft at the smokebox end. This layout was designed to position the regulator close to the firebox
Portable_engine
1994 suicide of Nirvana singer and guitarist
ISBN 978-1-4013-8176-9. Marc Covert (2003). "interview with greg sage". Smokebox.net. Archived from the original on July 16, 2007. Retrieved May 3, 2007
Suicide_of_Kurt_Cobain
Class of 30 three-cylinder 4-6-2 locomotives
to a curved profile forward of the smokebox front. Spun glass mattresses were used for boiler lagging. The smokebox was a sheet metal fabrication to the
SR_Merchant_Navy_class
Steam powered road roller
enough clearance from the boiler (and hence a larger front roll), the smokebox is extended forward substantially at the top to incorporate a support plate
Steamroller
the fire. It usually consists of the blastpipe (or first stage nozzle), smokebox, and chimney, although later designs also include second and third stage
Steam locomotive exhaust system
Steam_locomotive_exhaust_system
Steam locomotive exhaust system
smokebox gases. That exhausts into a third stage, designed by Chapelon, which mixes the resulting steam/smokebox gases mixture with yet more smokebox
Kylchap
Class of locomotives
steam locomotive. They had long side tanks that came to the front of the smokebox, which sloped forwards to improve visibility and had a recess cut in to
GNR_Class_J23
Class of British steam locomotives
their distinctive shape; their side tanks extended to the front of the smokebox and they had a distinct cut-out in the side tanks to access the motion
Midland_Railway_2000_Class
American rapper (born 1970)
internet. He is the host of the video podcasts The Dr. Greenthumb Show, The Smokebox and Meditation. In 2018, B-Real partnered with marijuana subscription box
B-Real
tubes to the smokebox. The rapid passage of gas was indicated by too high a temperature in the smokebox, and the choking of the smokebox by excessive
LMS 2 and 2A boilered 4-6-0 locomotives
LMS_2_and_2A_boilered_4-6-0_locomotives
A DRG Class 01 locomotive fitted with the large, distinctive Wagner smoke deflectors either side of the smokebox
Richard_Paul_Wagner
Belpaire firebox, the PRR-standard smokebox front, a raised headlight following PRR practice, and the bell moved from smokebox front to boiler top. Brakemen's
Pennsylvania Railroad class N2sa
Pennsylvania_Railroad_class_N2sa
Type of mechanism for controlling steam flow in a reciprocating steam engine
D57 class 4-8-2, with Gresley conjugated gear visible at front below the smokebox. The longer 2 to 1 Lever is located on the right side of the locomotive
Gresley_conjugated_valve_gear
Anti-vacuum valve in steam locomotives
from the smokebox could be sucked down the exhaust pipe and into the valve chest or cylinder, causing damage. (The exhaust is open to the smokebox because
Snifting_valve
Articulated locomotive wheel arrangement
the smokebox and the trailing truck under the firebox. On a cab-forward, the leading truck supports the firebox and the trailing truck and smokebox are
4-8-8-2
British locomotives
Company for the C&WJR. Builders No. 2553. The saddle tank did not cover the smokebox. Nameplates carried: South Lodge. (1884 to 1920) Renumbered: No known renumbering
Locomotives of the Furness Railway
Locomotives_of_the_Furness_Railway
Class of 20 American 4-8-8-2 locomotives
2-8-8-4 locomotive running in reverse, the tender being coupled at the smokebox end of the locomotive. This was made possible by the use of oil-firing
Southern_Pacific_class_AC-12
British train identifier
– the angle of the two arms and their position (on the buffer beam or smokebox) indicated the routing. Historically train reporting numbers were used
Train_reporting_number
Type of steam locomotive
to smokebox design took place. Extending the smokebox forward increased its volume. The increased amount of exhaust gases present in the smokebox had
CGR 4th Class 4-6-0TT 1882 Joy
CGR_4th_Class_4-6-0TT_1882_Joy
Class of British 4-6-0 locomotives
and was later removed, although the locomotive retained the extended smokebox for the superheater until 1917. The locomotives were equipped with “water
Highland_Railway_Castle_Class
Three related classes of 121 British 4-4-0 locomotives
D15/1, D15 as built with short smokebox, some with superheater LNER Class D15/2, D15 with superheater and long smokebox GER Class H88 (LNER Class D16)
GER_Classes_S46,_D56_and_H88
Locomotive using a steam turbine
negligible pressure, the original smokebox blastpipe had to be replaced by an electric draught fan in the smokebox. Performance was disappointing, and
Steam_turbine_locomotive
Class of 4-6-2 pacific locomotive designed by Sir Nigel Gresley
this included the modification of the upper smokebox area surrounding the chimney. Originally the whole smokebox wrapper was retained in order to form an
LNER Gresley Classes A1 and A3
LNER_Gresley_Classes_A1_and_A3
Canadian steam locomotive class
and nicknamed "Bullet Nose Bettys" due to their distinctive cone-shape smokebox door cover. The order for these engines came during World War II when steel
Canadian_National_Class_U-1-f
Technique for increasing the temperature of steam to improve steam engine efficiency
dry pipe into a superheater header mounted against the tube sheet in the smokebox. The steam is then passed through a number of superheater elements, which
Superheater
British steam locomotive
consisted of an arrangement of pipes and ejectors wrapping around the smokebox. These two locomotives were also built with better springing for smoother
GNR_Stirling_4-2-2
Preserved 4-6-2 steam locomotive
1950. In April 1952, the semi-streamlined sloping smokebox front was replaced with a round-topped smokebox. 46235 was repainted into BR Green livery from
LMS Princess Coronation Class 6235 City of Birmingham
LMS_Princess_Coronation_Class_6235_City_of_Birmingham
Class of 28 American 4-8-4 locomotives
mounted in a dual-headlight casing above the headlight in front of the smokebox door, and an all-weather cab. They were built in two separate groups, the
Southern_Pacific_GS-4_class
American songwriter, guitarist (b. 1951)
Nowhere to Nevermind. ISBN 9781606994337. Retrieved February 27, 2020. "Smokebox: Interview with Greg Sage". Archived from the original on July 16, 2007
Greg_Sage
Class of eight British 4-4-0 locomotives
two engines, FR Nos. 34 and 37, were fitted with experimental Phoenix smokebox superheaters, however, these were removed the following year. At some point
Furness_Railway_K2_Class
Class of 52 4-4-4-4 duplex locomotives
refers to the T1's as Land Dreadnaughts. The aggressive angles of the smokebox prow and accompanying portholes on the lower sides give the impression
Pennsylvania Railroad class T1
Pennsylvania_Railroad_class_T1
Preserved N&W class M 4-8-0 locomotive
head-on collision with an excavator and was repaired with a new front smokebox plate and headlight. In early 2025, No. 475 was masquerading as No. 429
Norfolk_and_Western_475
Experimental steam locomotive
Q1's streamlined design consisted of a blunt nosecone in front of the smokebox, extended side skirts covering the locomotive's pipework, and a streamlined
Pennsylvania Railroad class Q1
Pennsylvania_Railroad_class_Q1
British steam locomotive class (1909–1957)
Class 27 locomotive, which 18 inches (460 mm) cylinders. Furthermore, the smokebox was extended to accommodate the superheater header, the footplate and the
L&YR_Class_28
Unusual type of articulated locomotive
engine such that when the locomotive traverses a curved track, the front (smokebox) end of the boiler overhangs toward the outside of the curve. The jointed
Jointed-boiler_locomotive
1953 design of condensing steam locomotive
front of the smokebox. Apart from the usual round smokebox door in the centre of the smokebox front plate, the complete front smokebox plate on both
South_African_Class_25_4-8-4
Glossary of the main components of a typical steam locomotive
through the firebed. The smokebox may contain a cinder guard to prevent hot cinders being expelled. Components in the smokebox are: Blower Vertical pipe
Steam_locomotive_components
American civil engineer (1795–1885)
Jervis's steam locomotive, Experiment, was the first locomotive with a truck, which guides the locomotive into curves while also supporting the smokebox
John_B._Jervis
saddle tank. It was rebuilt with smaller buffers, back cab wall, and new smokebox door sometime between 1942 and 1964. In 1962, it was replaced by E421 and
GS&WR_Sambo
Class of NYC 4-8-2 locomotives
heaters (mostly of the Elesco type and generally mounted in front of the smokebox at the top). Later L-2 subclasses, the L-2b and L-2d, had somewhat smoother
New_York_Central_Mohawk
when procurement was halted in favour of the Prussian S 6. Up to 1906 a smokebox superheater was installed; afterwards smoke tube superheaters were used
Prussian_S_4
Preserved British steam locomotive
April 1952 into Brunswick green. The semi-streamlined smokebox was replaced with a round-topped smokebox in February 1957, and in September 1958 the locomotive
LMS Princess Coronation Class 6229 Duchess of Hamilton
LMS_Princess_Coronation_Class_6229_Duchess_of_Hamilton
Preserved American CB&Q O-1A class 2-8-2 locomotive
Casper shop crew quickly replaced the damaged headlight bracket on the smokebox door with a makeshift platform. On October 20, during the 50th anniversary
Grand_Canyon_Railway_4960
Type of pump using high pressure fluid to entrain a lower pressure fluid
blastpipe and chimney in the locomotive smokebox. The sketch on the right shows a cross section through a smokebox, rotated 90 degrees; it can be seen that
Injector
Class of 74 two-cylinder 4-6-0 locomotives
restricted to the front end of the N15's barrel to reduce the diameter of the smokebox, and consequently the weight carried by the front bogie. The design also
LSWR_N15_class
Locomotive wheel arrangement
Visual evidence of this altered and slightly longer smokebox is the locomotive's banjo-face smokebox front. The condensing system proved extremely efficient
4-8-4
Preserved American 2-6-6-2 locomotive
is emphasized by its two cross compound air compressors mounted on the smokebox door to supply enough air for frequent heavy braking. The class was unusual
Chesapeake_and_Ohio_1308
2-6-2 preserved English steam locomotive
nameplates were replaced with straight nameplates mounted on the sides of the smokebox. In order to do this, the builder's plate (Doncaster Works No. 1837) had
LNER Class V2 4771 Green Arrow
LNER_Class_V2_4771_Green_Arrow
British steam locomotive class (1918–1920)
raised front running board in front of the smokebox and cylinders and the wing plates on the side of the smokebox. The first 12 members of the class (300-311)
Caledonian_Railway_300_Class
Class of 301 American 4-8-2 locomotives
class M1a had several improvements. Instead of separate cylinder block and smokebox saddle castings, the M1a had a one-piece casting (first seen on the K5
Pennsylvania Railroad class M1
Pennsylvania_Railroad_class_M1
Class of 2-10-4 steam locomotives
Pennsylvania Railroad's steam locomotives, the J1 had its headlight above the smokebox. Like the M1 the J1 had a keystone numberplate, unlike the round numberplates
Pennsylvania Railroad class J1
Pennsylvania_Railroad_class_J1
British steam locomotive under construction
Wales's boiler is 17 inches (430 mm) shorter than the original, and the smokebox is 17 inches longer. The change was made because the extra boiler length
LNER P2 Class 2007 Prince of Wales
LNER_P2_Class_2007_Prince_of_Wales
Preserved British locomotive
lining. 21C9 was one of several in a variant of this livery, in which the smokebox cowls were painted green instead of black. Shaw Savill was repainted in
SR Merchant Navy Class 35009 Shaw Savill
SR_Merchant_Navy_Class_35009_Shaw_Savill
Class of 251 two-cylinder 2-10-0 locomotives
smokebox was only used during lighting up. In normal working the gases went through firetubes inside the preheater drum that led to a second smokebox
BR_Standard_Class_9F
Class of 6 three-cylinder 2-6-0 locomotives
gauge-friendly shape of the cab, the tender and the large-diameter smokebox. The smokebox housed a large superheater, regulator valve and snifting (anti-vacuum)
SECR_N1_class
Preserved British steam locomotive
When filmed, Olton Hall carried a "Hogwarts Express" headboard on the smokebox, featuring the Hogwarts school crest. The same emblem is featured as part
GWR 4900 Class 5972 Olton Hall
GWR_4900_Class_5972_Olton_Hall
Class of 4 British 0-6-2T locomotives
The first two locos, numbers 94 & 95 were fitted with smokebox superheaters, with the smokebox extended to accommodate this and the chimney set far forward
Furness_Railway_94_class
Rail liveries introduced by British Rail
Blue colour scheme and the double arrow logo on their side tanks. The smokebox, running plate and running gear remained black; the bufferbeam remained
British Rail corporate liveries
British_Rail_corporate_liveries
Prussian express steam locomotive
coupled wheels. Low-pressure cylinders, located inside the frame under the smokebox, drove the first driving axle via a crank axle. This made both coupled
Prussian_S_5.1
Austrian locomotive designer and engineer
Technical College in Vienna. In 1924 he published a technical article on smokebox design and chimneys. In 1925 he received his diploma as an engineer, and
Adolph_Giesl-Gieslingen
Preserved Union Pacific steam locomotive
Boy nickname after an unknown ALCO worker scrawled it in chalk on the smokebox door of No. 4000, the first of its class. The Big Boy was articulated like
Union_Pacific_4014
Raised lip on the funnel of a ship or steam locomotive
it on meeting the back rim. This increases the pressure in the engine's smokebox, interfering with the process of drawing exhaust through from the firebox
Capuchon_(chimney)
Small vertical boiler
than a water jacket. The exhaust from the fire-tubes is into an external smokebox and a vertical flue. For maintenance access to the tubes, a manhole is
Vertical boiler with horizontal fire-tubes
Vertical_boiler_with_horizontal_fire-tubes
Device fitted to a steam engine to supply lubricating oil
valves, often on either side of the smokebox or one lubricator would be placed behind the smokebox. The behind-smokebox configuration has the advantage that
Automatic_lubricator
Mode of transport
the boiler to create pressurized steam. The steam travels through the smokebox before leaving via the chimney or smoke stack. In the process, it powers
Rail_transport
Preserved Santa Fe 769 class 2-8-0 locomotive
condition. Some features of No. 769 remain in disrepair, including the smokebox, which is corroded and filled with sawdust due to the locomotive's uncovered
Santa_Fe_769
the SCHWAAN and the NEBEL the cylinders were angled and attached to the smokebox, the valve gear was external as well. HULDA had a screw reversing gear
Mecklenburg_I
Type of failure of a steam engine
Similar blowback can be caused by debris or other obstructions in the smokebox. In the days when steam-hauled trains were common in the United Kingdom
Blowback_(steam_engine)
Design of steam boiler best known for its use on ships
and out of the chimney. The ends of these multiple tubes are capped by a smokebox, outside the boiler shell. The Scotch boiler is a fire-tube boiler, in
Scotch_marine_boiler
Class of four-cylinder 4-6-0 locomotives
four-cylinder layout, with the inside cylinders placed forward under the smokebox and the outside cylinders placed far back, in line with the rear wheels
GWR_4000_Class
Preserved American 2-10-0 locomotive
Colorado, mill. During World War II, it was modified with an extended smokebox to accommodate poor-quality lignite coal. This upgrade followed a rebuild
Great_Western_90
Steam locomotive by Robert Stephenson in 1829
enlarged and the shape simplified; and the locomotive was given a drum smokebox. It was in this form that the engine was preserved, which were seen as
Stephenson's_Rocket
Class of 184 three-cylinder 2-6-2 locomotives
modified: they can be identified by the presence of external steam pipes from smokebox to cylinders. Finally, around 1960 experiments were made with fitting double
LNER_Class_V2
Vehicle incorporating streamlining in a shape providing reduced air resistance
and smoke-lifting skirting along the boiler that left the silver-painted smokebox on full display. The trend of streamliners also came to Japan. In 1934
Streamliner
Steam locomotive
was the locomotive's smokebox. Unlike earlier designs, such as that of the General, built a year earlier, No. 25 had its smokebox sitting on a "saddle"
William_Mason_(locomotive)
Class of British steam locomotives
Ramsbottom's predecessor, Francis Trevithick. They had an open cab, a smokebox door that opened vertically, and open slots on the "splashers" that covered
LNWR_Lady_of_the_Lake_Class
The steam dome with its safety valve sat on the forward shell ring. The smokebox was very short. The smokestack has a Kobel spark arrestor. Later a Prüsmann
Mecklenburg_XIX
(Betriebsarbeiter). This involved emptying the ash and clinker from the smokebox and grate into an ashpit sunk between the tracks. This was a particularly
Bahnbetriebswerk (steam locomotives)
Bahnbetriebswerk_(steam_locomotives)
Class of 105 two-cylinder 0-4-4T locomotives
to flat, smokebox door was implemented on numbers 252–256. In 1900 the design was modified to incorporate the sandboxes inside the smokebox; these were
LSWR_M7_class
Class of mixed traffic steam engines
Modifications were made to the suspension of the pony truck and to the smokebox layout before three further examples (Nos. 339-341) with slightly larger
LB&SCR_K_class
Class of 110 three-cylinder 4-6-2 locomotives
resemblance to the distinctive tin cans in which "SPAM" was sold. The smokebox was an integral part of the air-smoothed casing, being a sheet metal fabrication
SR West Country and Battle of Britain classes
SR_West_Country_and_Battle_of_Britain_classes
Preserved American Ms class 2-8-2 steam locomotive
of its front smokebox to the center of its smokebox door. The bell was moved from the top of the boiler to the top front of the smokebox. The long, sharply
Southern_Railway_4501
characteristics of American locomotive practice, such as bar frames, and the smokebox being a separate piece from the steam chest, the latter being a "saddle"
Port Talbot Railway 0-8-2T (Cooke)
Port_Talbot_Railway_0-8-2T_(Cooke)
Class of two-cylinder 0-4-0ST locomotives
was admitted to the cylinders by outside steam pipes mid-way along the smokebox. Lubrication to the cylinders was by cylinder taps mounted over the cylinders
BNCR_Class_N
Steam locomotive
had a minor accident where its large "balloon" stack was knocked off the smokebox. It was later discovered that the stack was nearly one foot (30 cm) taller
Mastodon_(steam_locomotive)
Class of 6 American 4-8-4 locomotives
Company for high-speed passenger service in 1935. They featured a silver smokebox with a cone-shaped single headlight casing, skyline casing on the top of
Southern_Pacific_GS-2_class
Proserpine Mill No 1 (1939) with a short chimney, the small sand boxes and the red and light lights on the smokebox door
Perry_Engineering
Class of Northern Irish 4-4-0 locomotives
allow the firebox and ash pan to clear the rear driving wheel axle. The smokebox saddle was extended accordingly to offer support. The closely coupled driving
NCC_Class_B3
Locomotive classes
preference for big engines and the rejection of superheating in favour of smokebox steam driers. The first products of this approach on the G&SWR were the
G&SWR_131_and_137_Class_4-4-0
Chassis for wheels and suspension under vehicles
a bogie to guide the locomotive into curves while also supporting the smokebox was built by John B. Jervis in 1831. In 1834, the American Ross Winans
Bogie
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