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[[File:GWR_Diagram_AA15.jpg|thumb|300px|right|GWR Wagon Diagram AA15, 20 Ton 'Toad' brake van, August 1918]]
'''GWR Diagram codes''' were introduced by George Jackson Churchward to allow easy reference to different types of coaching stock. The Diagram Code for each type consisted of one or two letters which represented the general category, and a number which denoted particular design of that type, such as A28 or DD3.<ref>[https://en.wikipedia.org/wiki/Coaches_of_the_Great_Western_Railway#Diagram_codes Wikipedia]</ref>. The Diagram Index for wagons was first prepared circa 1905, followed by a similar index for wagons around 1910.<ref>[[Bibliography#Other References|Atkins, Beard & Tourret (2013)]] pp. 490-494.</ref>
The numbering schemes used for coaching stock and wagons ran in parallel, so the same codes appeared in both. Thus on the SVR, [[GWR 1257 Siphon G Bogie Milk Van | Siphon G 1257]] was built to Coaching Stock diagram O11 while [[GWR 13154 5 plank Open Goods Wagon | 5-plank Open Wagon 13154]] was built to Wagon diagram O11. The GWR Diagram Book which listed the diagrams typically allocated a page for each diagram which showed its major dimensions and characteristics.
Coaches and Wagons (and also locomotives and tenders) were generally built in batches known as '''Lots''', with each lot number being allocated in sequence when ordered. The four groups of Lot numbers also ran in parallel. Some designs which pre-dated the introduction of Diagram Codes were never allocated Diagram codes even if construction continued after that time and were identified by their 'old series' Lot number. SVR examples include [[GWR 41277 4 plank Open Goods Wagon|GWR 41277]] of 1890.
Other railway companies used broadly similar systems of Diagrams and Lots, although using different combinations of letters and numbers.
==Coaching stock diagrams==
The table below shows the letters allocated to each category and the examples currently resident on the SVR.
{| class="wikitable"
! Diagram !! Description !! SVR Examples !! Notes
|-
| A || Bogie first class || [[GWR 178 Autotrailer Third | 178]], [[GWR 238 Autotrailer Third | 238]] ||
|-
| B || Bogie second class || ||
|-
| C || Bogie third class || [[GWR 829 Full Third | 829]], [[GWR 1086 Full Third | 1086]], [[GWR 1087 Full Third | 1087]], [[GWR 1116 Full Third | 1116]], [[GWR 1146 Full Third | 1146]], [[GWR Full Third 2119 | 2119]], [[GWR 2426 Toplight Full Third | 2426]], [[GWR 3930 Full Third | 3930]], [[GWR 4786 Full Third | 4786]] ||
|-
| D || Bogie brake third || [[GWR 650 Brake Third Open (Excursion) | 650]], [[GWR 2233 Corridor Brake Third | 2233]], [[GWR 2242 Corridor Brake Third | 2242]] [[GWR 5804 Brake Third | 5804]], [[GWR 5883 Brake Third | 5883]] ||
|-
| E || Bogie composite and Brake composite|| [[GWR 6045 Bow-end Composite | 6045]], [[GWR 6562 Brake Composite | 6562]], [[GWR 6913 Brake Composite | 6913]], [[GWR 7284 Composite | 7284]] ||
|-
| F || Slip coach|| ||
|-
| G || Saloon || [[GWR 9055 Nondescript Saloon | 9055]], [[GWR 9103 Nondescript Saloon | 9103]], [[GWR 9369 Nondescript Saloon | 9369]] ||
|-
| H || Catering vehicle || [[GWR 9581 Wheelchair accessible Buffet Car| 9581]], [[GWR 9615 Kitchen Diner First | 9615]], [[GWR 9627 Restaurant Third | 9627]], [[GWR 9653 Restaurant Third | 9653]], [[GWR 9654 Restaurant Third | 9654]]||
|-
| J || Sleeping car || [[GWR 9084 First Sleeper | 9084]], [[GWR 9085 First Sleeper|9085]] ||
|-
| K || Passenger brake van || [[GWR 98 Full Brake | 98]], [[GWR 261 Toplight 'Snake C' Passenger Brake | 261]], [[GWR 1145 Toplight 'Snake C' Passenger Brake | 1145]] ||
|-
| L || Mail van || ||
|-
| M || Bogie parcels van (and similar) || ||
|-
| N || Horse box || ||
|-
| O || Milk van / tank || [[GWR 1257 Siphon G Bogie Milk Van | 1257]], [[GWR 1399 Milk Brake | 1399]], [[GWR 2926 Siphon G Bogie Milk Van | 2926]] ||
|-
| P || Carriage truck || ||
|-
| Q || Inspection saloon || [[GWR 80969 Inspection Saloon | 80969]], [[GWR 80972 Inspection Saloon | 80972]] ||
|-
| R || 4-wheeled first class || ||
|-
| S || 4-wheeled third class || ||
|-
| T || 4-wheeled brake third || ||
|-
| U || 4-wheeled composite / brake composite || ||
|-
| V || 4-wheeled brake van || ||
|-
| W || Parcels and Miscellaneous van || ||
|}
==Wagon diagrams==
The table below shows the letters allocated to each category and the examples currently resident on the SVR.
{| class="wikitable"
! Diagram !! Description !! SVR Examples !! Notes
|-
| A || Girder Wagons|| || Articulated wagons for boilers, guns, bridge girders etc.
|-
| B || Armour plate and roll wagons || ||
|-
| C || Boiler trucks and trolleys || ||
|-
| D || Plate glass wagons || ||
|-
| E || Wheel and propeller wagons || ||
|-
| F || Steam roller trucks || ||
|-
| G || Motor car trucks || [[GWR 41990 'Loriot Y' Machinery Truck | 41990]], [[GWR 42138 'Loriot D' Machinery Truck | 42138]], [[GWR 42272 'Loriot L' Machinery Truck | 42272]], [[GWR 42343 Machinery Flat | 42343]], [[GWR 65801 Mogo Van | 65801]] ||
|-
| H || Flat wagons || [[GWR 39860 'Conflat' Container Wagon | 39860]] ||
|-
| J || Rail and timber wagons || [[GWR 60841 Bogie Bolster | 60841]], [[GWR 107291 Macaw B Bogie Bolster | 107291]] ||
|-
| K || Crane testing wagons || ||
|-
| L || Match trucks || ||
|-
| M || Shunters trucks || [[GWR 41736 Shunters Truck | 41736]] ||
|-
| N || Coal and mineral wagons || [[GWR 83831 Loco Coal Wagon | 83831]] ||
|-
| O || Open merchandise wagons || [[GWR 2504 Milk Tank Wagon | 2504]], [[GWR 13154 5 plank Open Goods Wagon | 13154]], [[GWR 25190 5 plank Open Goods Wagon | 25190]], [[GWR 94059 China Clay Open Wagon | 94059]], [[GWR 97398 5 plank Open Goods Wagon | 97398]], [[GWR 98480 5 plank Open Goods Wagon | 98480]], [[GWR 99965 Open 'C' Goods Wagon | 99965]], [[GWR 102691 5 plank Open Goods Wagon | 102691]], [[GWR 108085 5 plank Open Goods Wagon | 108085]] ||
|-
| P || Ballast and sand wagons || [[GWR 30903 Ballast Wagon | 30903]], [[GWR 40841 Ballast Wagon | 40841]], [[GWR 60562 Ballast Wagon | 60562]], [[GWR 60906 Ballast Wagon | 60906]], [[GWR 80225 Ballast Wagon | 80225]], [[GWR 80603 Ballast Wagon | 80603]], [[GWR 80684 Ballast Wagon | 80684]] ||
|-
| Q || Provender wagons || ||
|-
| R || Manure wagons || ||
|-
| S || Fish wagons || ||
|-
| T || Permanent way wagons || [[GWR 14428 Open Wagon (Signal Dept) | 14428]], [[GWR 40554 Chaired Sleeper Wagon | 40554]] ||
|-
| U || Stone wagons || ||
|-
| V || Covered goods vans || [[GWR 58725 Improvised Gunpowder Van | 58725]], [[GWR 65620 'Vanfit' Covered Goods Van | 65620]], [[GWR 82554 Banana Van | 82554]], [[GWR 93016 Mink 'A' Covered Goods Van | 93016]], [[GWR 93045 Mink 'A' Covered Goods Van | 93045]], [[GWR 95353 Mink 'A' Covered Goods Van | 95353]], [[GWR 101961 Mink 'A' Covered Goods Van | 101961]], [[GWR 103592 Mink 'A' Covered Goods Van | 103592]], [[GWR 104621 Mink 'A' Covered Goods Van | 104621]], [[GWR 112889 Mink 'G' Covered Goods Van | 112889]] ||
|-
| W || Cattle trucks || ||
|-
| X || Meat vans ||[[GWR 105873 'Mica B' Refrigerated Meat Van | 105873]] ||
|-
| Y || Fruit vans || [[GWR 2303 Fruit Van | 2303]], [[GWR 2424 Fruit Van | 2424]], [[GWR 2815 Fruit C Van | 2815]], [[GWR 3429 Fruit D Van | 3429]], [[GWR 3467 Fruit D Van | 3467]], [[GWR 134290 Fruit A Van | 134290]] ||
|-
| Z || Gunpowder vans || || 'Improvised' gunpowder vans are under Diagram V
|-
| AA || Brake vans ||[[GWR 17410 'Toad' 20T Goods Brake Van | 17410]], [[GWR 40362 PW Brake Van | 40362]], [[GWR 68501 'Toad' 20T Goods Brake Van | 68501]] ||
|-
| BB || Stores vans || ||
|-
| CC || Tool and workshop vans || [[GWR 14984 Workshop Van (Signal Dept) | 14984]], [[GWR 80982 Signal Dept Van| 80982]]||
|-
| DD || Tank wagons || [[GWR 43989 Cylindrical Tank Wagon | 43989]], [[GWR 80990 Cylindrical Tank Wagon | 80990]] ||
|-
| EE || Flat wagons for tanks || ||
|-
| FF || Trestle plate wagons || ||
|}
==See also==
*[[Carriages]]
*[[Goods Wagons]]
*[[Telegraph codes]]
==References==
<references/>
==Links==
*[https://en.wikipedia.org/wiki/Great_Western_Railway_wagons#Diagram_codes Great Western Railway wagons: Diagram codes] on Wikipedia
*[https://en.wikipedia.org/wiki/Coaches_of_the_Great_Western_Railway#Diagram_codes Coaches of the Great Western Railway: Diagram codes] on Wikipedia
'''GWR Diagram codes''' were introduced by George Jackson Churchward to allow easy reference to different types of coaching stock. The Diagram Code for each type consisted of one or two letters which represented the general category, and a number which denoted particular design of that type, such as A28 or DD3.<ref>[https://en.wikipedia.org/wiki/Coaches_of_the_Great_Western_Railway#Diagram_codes Wikipedia]</ref>. The Diagram Index for wagons was first prepared circa 1905, followed by a similar index for wagons around 1910.<ref>[[Bibliography#Other References|Atkins, Beard & Tourret (2013)]] pp. 490-494.</ref>
The numbering schemes used for coaching stock and wagons ran in parallel, so the same codes appeared in both. Thus on the SVR, [[GWR 1257 Siphon G Bogie Milk Van | Siphon G 1257]] was built to Coaching Stock diagram O11 while [[GWR 13154 5 plank Open Goods Wagon | 5-plank Open Wagon 13154]] was built to Wagon diagram O11. The GWR Diagram Book which listed the diagrams typically allocated a page for each diagram which showed its major dimensions and characteristics.
Coaches and Wagons (and also locomotives and tenders) were generally built in batches known as '''Lots''', with each lot number being allocated in sequence when ordered. The four groups of Lot numbers also ran in parallel. Some designs which pre-dated the introduction of Diagram Codes were never allocated Diagram codes even if construction continued after that time and were identified by their 'old series' Lot number. SVR examples include [[GWR 41277 4 plank Open Goods Wagon|GWR 41277]] of 1890.
Other railway companies used broadly similar systems of Diagrams and Lots, although using different combinations of letters and numbers.
==Coaching stock diagrams==
The table below shows the letters allocated to each category and the examples currently resident on the SVR.
{| class="wikitable"
! Diagram !! Description !! SVR Examples !! Notes
|-
| A || Bogie first class || [[GWR 178 Autotrailer Third | 178]], [[GWR 238 Autotrailer Third | 238]] ||
|-
| B || Bogie second class || ||
|-
| C || Bogie third class || [[GWR 829 Full Third | 829]], [[GWR 1086 Full Third | 1086]], [[GWR 1087 Full Third | 1087]], [[GWR 1116 Full Third | 1116]], [[GWR 1146 Full Third | 1146]], [[GWR Full Third 2119 | 2119]], [[GWR 2426 Toplight Full Third | 2426]], [[GWR 3930 Full Third | 3930]], [[GWR 4786 Full Third | 4786]] ||
|-
| D || Bogie brake third || [[GWR 650 Brake Third Open (Excursion) | 650]], [[GWR 2233 Corridor Brake Third | 2233]], [[GWR 2242 Corridor Brake Third | 2242]] [[GWR 5804 Brake Third | 5804]], [[GWR 5883 Brake Third | 5883]] ||
|-
| E || Bogie composite and Brake composite|| [[GWR 6045 Bow-end Composite | 6045]], [[GWR 6562 Brake Composite | 6562]], [[GWR 6913 Brake Composite | 6913]], [[GWR 7284 Composite | 7284]] ||
|-
| F || Slip coach|| ||
|-
| G || Saloon || [[GWR 9055 Nondescript Saloon | 9055]], [[GWR 9103 Nondescript Saloon | 9103]], [[GWR 9369 Nondescript Saloon | 9369]] ||
|-
| H || Catering vehicle || [[GWR 9581 Wheelchair accessible Buffet Car| 9581]], [[GWR 9615 Kitchen Diner First | 9615]], [[GWR 9627 Restaurant Third | 9627]], [[GWR 9653 Restaurant Third | 9653]], [[GWR 9654 Restaurant Third | 9654]]||
|-
| J || Sleeping car || [[GWR 9084 First Sleeper | 9084]], [[GWR 9085 First Sleeper|9085]] ||
|-
| K || Passenger brake van || [[GWR 98 Full Brake | 98]], [[GWR 261 Toplight 'Snake C' Passenger Brake | 261]], [[GWR 1145 Toplight 'Snake C' Passenger Brake | 1145]] ||
|-
| L || Mail van || ||
|-
| M || Bogie parcels van (and similar) || ||
|-
| N || Horse box || ||
|-
| O || Milk van / tank || [[GWR 1257 Siphon G Bogie Milk Van | 1257]], [[GWR 1399 Milk Brake | 1399]], [[GWR 2926 Siphon G Bogie Milk Van | 2926]] ||
|-
| P || Carriage truck || ||
|-
| Q || Inspection saloon || [[GWR 80969 Inspection Saloon | 80969]], [[GWR 80972 Inspection Saloon | 80972]] ||
|-
| R || 4-wheeled first class || ||
|-
| S || 4-wheeled third class || ||
|-
| T || 4-wheeled brake third || ||
|-
| U || 4-wheeled composite / brake composite || ||
|-
| V || 4-wheeled brake van || ||
|-
| W || Parcels and Miscellaneous van || ||
|}
==Wagon diagrams==
The table below shows the letters allocated to each category and the examples currently resident on the SVR.
{| class="wikitable"
! Diagram !! Description !! SVR Examples !! Notes
|-
| A || Girder Wagons|| || Articulated wagons for boilers, guns, bridge girders etc.
|-
| B || Armour plate and roll wagons || ||
|-
| C || Boiler trucks and trolleys || ||
|-
| D || Plate glass wagons || ||
|-
| E || Wheel and propeller wagons || ||
|-
| F || Steam roller trucks || ||
|-
| G || Motor car trucks || [[GWR 41990 'Loriot Y' Machinery Truck | 41990]], [[GWR 42138 'Loriot D' Machinery Truck | 42138]], [[GWR 42272 'Loriot L' Machinery Truck | 42272]], [[GWR 42343 Machinery Flat | 42343]], [[GWR 65801 Mogo Van | 65801]] ||
|-
| H || Flat wagons || [[GWR 39860 'Conflat' Container Wagon | 39860]] ||
|-
| J || Rail and timber wagons || [[GWR 60841 Bogie Bolster | 60841]], [[GWR 107291 Macaw B Bogie Bolster | 107291]] ||
|-
| K || Crane testing wagons || ||
|-
| L || Match trucks || ||
|-
| M || Shunters trucks || [[GWR 41736 Shunters Truck | 41736]] ||
|-
| N || Coal and mineral wagons || [[GWR 83831 Loco Coal Wagon | 83831]] ||
|-
| O || Open merchandise wagons || [[GWR 2504 Milk Tank Wagon | 2504]], [[GWR 13154 5 plank Open Goods Wagon | 13154]], [[GWR 25190 5 plank Open Goods Wagon | 25190]], [[GWR 94059 China Clay Open Wagon | 94059]], [[GWR 97398 5 plank Open Goods Wagon | 97398]], [[GWR 98480 5 plank Open Goods Wagon | 98480]], [[GWR 99965 Open 'C' Goods Wagon | 99965]], [[GWR 102691 5 plank Open Goods Wagon | 102691]], [[GWR 108085 5 plank Open Goods Wagon | 108085]] ||
|-
| P || Ballast and sand wagons || [[GWR 30903 Ballast Wagon | 30903]], [[GWR 40841 Ballast Wagon | 40841]], [[GWR 60562 Ballast Wagon | 60562]], [[GWR 60906 Ballast Wagon | 60906]], [[GWR 80225 Ballast Wagon | 80225]], [[GWR 80603 Ballast Wagon | 80603]], [[GWR 80684 Ballast Wagon | 80684]] ||
|-
| Q || Provender wagons || ||
|-
| R || Manure wagons || ||
|-
| S || Fish wagons || ||
|-
| T || Permanent way wagons || [[GWR 14428 Open Wagon (Signal Dept) | 14428]], [[GWR 40554 Chaired Sleeper Wagon | 40554]] ||
|-
| U || Stone wagons || ||
|-
| V || Covered goods vans || [[GWR 58725 Improvised Gunpowder Van | 58725]], [[GWR 65620 'Vanfit' Covered Goods Van | 65620]], [[GWR 82554 Banana Van | 82554]], [[GWR 93016 Mink 'A' Covered Goods Van | 93016]], [[GWR 93045 Mink 'A' Covered Goods Van | 93045]], [[GWR 95353 Mink 'A' Covered Goods Van | 95353]], [[GWR 101961 Mink 'A' Covered Goods Van | 101961]], [[GWR 103592 Mink 'A' Covered Goods Van | 103592]], [[GWR 104621 Mink 'A' Covered Goods Van | 104621]], [[GWR 112889 Mink 'G' Covered Goods Van | 112889]] ||
|-
| W || Cattle trucks || ||
|-
| X || Meat vans ||[[GWR 105873 'Mica B' Refrigerated Meat Van | 105873]] ||
|-
| Y || Fruit vans || [[GWR 2303 Fruit Van | 2303]], [[GWR 2424 Fruit Van | 2424]], [[GWR 2815 Fruit C Van | 2815]], [[GWR 3429 Fruit D Van | 3429]], [[GWR 3467 Fruit D Van | 3467]], [[GWR 134290 Fruit A Van | 134290]] ||
|-
| Z || Gunpowder vans || || 'Improvised' gunpowder vans are under Diagram V
|-
| AA || Brake vans ||[[GWR 17410 'Toad' 20T Goods Brake Van | 17410]], [[GWR 40362 PW Brake Van | 40362]], [[GWR 68501 'Toad' 20T Goods Brake Van | 68501]] ||
|-
| BB || Stores vans || ||
|-
| CC || Tool and workshop vans || [[GWR 14984 Workshop Van (Signal Dept) | 14984]], [[GWR 80982 Signal Dept Van| 80982]]||
|-
| DD || Tank wagons || [[GWR 43989 Cylindrical Tank Wagon | 43989]], [[GWR 80990 Cylindrical Tank Wagon | 80990]] ||
|-
| EE || Flat wagons for tanks || ||
|-
| FF || Trestle plate wagons || ||
|}
==See also==
*[[Carriages]]
*[[Goods Wagons]]
*[[Telegraph codes]]
==References==
<references/>
==Links==
*[https://en.wikipedia.org/wiki/Great_Western_Railway_wagons#Diagram_codes Great Western Railway wagons: Diagram codes] on Wikipedia
*[https://en.wikipedia.org/wiki/Coaches_of_the_Great_Western_Railway#Diagram_codes Coaches of the Great Western Railway: Diagram codes] on Wikipedia
