Data from Maurice Demoulin, Traite Pratique de la Machine Locomotive (Paris: Libraire Polytechnique, Baudry et Cie, 1898), pp. 125-126. These were built by Fives-Lille (15)SACM (15), and SociTtT J. F. Cail & Cie. (10) Locobase 11268 described the class derived from PLM's Bourbonnaise 6-coupled; it entered service on the Etat in 1874. This batch was based on a Midi class, although it was "noticeably less powerful". The dome was positioned well forward (as in the 3139 class); it contained not only the safety-valve assembly, but also the swan's neck regulator.
Data from Maurice Demoulin, Traite Pratique de la Machine Locomotive (Paris: Libraire Polytechnique, Baudry et Cie, 1898), pp. 125-126.As Demoulin noted, these six-coupled engines took their lines from the widely distributed Bourbonnaise class of the PLM (Locobase 599). The boilers had a bit less heating surface area, the grate a skosh more. They had a typical Etat look, he says, in placing a large dome with internal safety valve well forward on the boiler and using balanced valves. See Locobase 11269 for the variant that rolled on 1,500-mm diameter drivers.
Data from Maurice Demoulin, Traite Pratique de la Machine Locomotive (Paris: Libraire Polytechnique, Baudry et Cie, 1898), pp. 125-126.Produced in the same mold as the 3069s (Locobase 11269) that were themselves based on the Midi's 6-coupled engine, this later batch had larger cylinders and a slightly larger grate.
Data from A Mallet, "Developpment de L'Application du System Compound", Memoirs ...Societe des Ingenieurs Civils, Annee [Juillet] 1890, Vol II (Paris: SIC, 1890). table pp. 42-43.Another example of Mallet's own two-cylinder cross-compounding system.
Data from SACM diagram Nr. 65 from Societe Alsacienne de Constructions Mecaniques from locomotive book supplied by Dany Machi up at  asDiagrammes des machines SACM construites a GRAFENSTADEN (October 2007). Tube diameter is the interior measurement. The relatively tall drivers mark this six-coupled as a mixed-traffic locomotive (and as its designation "Mixte" implies).
Principal Dimensions by Steve Llanso of Sweat House Media
|Number in Class||40||88||70|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||11.15 / 3.40||11.06 / 3.37||11.15 / 3.40||11.48 / 3.50|
|Engine Wheelbase (ft / m)||11.15 / 3.40||11.06 / 3.37||11.15 / 3.40||11.48 / 3.50|
|Ratio of driving wheelbase to overall engine wheelbase||1||1||1||1|
|Overall Wheelbase (engine & tender) (ft / m)||34.57 / 10.54|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||73,855 / 33,500||80,248 / 36,400||73,855 / 33,500||73,855 / 33,500||71,430 / 32,400|
|Engine Weight (lbs / kg)||73,855 / 33,500||80,248 / 36,400||73,855 / 33,500||73,855 / 33,500||71,430 / 32,400|
|Tender Loaded Weight (lbs / kg)||44,092 / 20,000|
|Total Engine and Tender Weight (lbs / kg)||115,522 / 52,400|
|Tender Water Capacity (gals / ML)||1716 / 6.50|
|Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)||4.80 / 4|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||41 / 20.50||45 / 22.50||41 / 20.50||41 / 20.50||40 / 20|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||59.10 / 1500||52 / 1320||59.10 / 1500||59.40 / 1510||59.40 / 1510|
|Boiler Pressure (psi / kPa)||127.60 / 8.80||127.60 / 8.80||127.60 / 8.80||130.50 / 9||130.50 / 9|
|High Pressure Cylinders (dia x stroke) (in / mm)||16.54" x 23.62" / 420x600||17.72" x 25.59" / 450x650||18.5" x 23.62" / 470x600||16.54" x 23.62" / 420x600 (1)||16.54" x 23.62" / 420x600|
|Low Pressure Cylinders (dia x stroke) (in / mm)||23.62" x 23.62" / 600x600 (1)|
|Tractive Effort (lbs / kg)||11,859 / 5379.16||16,760 / 7602.22||14,836 / 6729.50||8097 / 3672.74||12,067 / 5473.51|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||6.23||4.79||4.98||9.12||5.92|
|Tubes (number - dia) (in / mm)||164 - 1.772" / 45|
|Flues (number - dia) (in / mm)|
|Flue/Tube length (ft / m)||14.11 / 4.30|
|Firebox Area (sq ft / m2)||73.52 / 6.83|
|Grate Area (sq ft / m2)||13.02 / 1.21||14.85 / 1.38||14.53 / 1.35||12.91 / 1.20||13.02 / 1.21|
|Evaporative Heating Surface (sq ft / m2)||1098 / 102||1318 / 122.49||1098 / 102||1084 / 100.70||1135 / 105.43|
|Superheating Surface (sq ft / m2)|
|Combined Heating Surface (sq ft / m2)||1098 / 102||1318 / 122.49||1098 / 102||1084 / 100.70||1135 / 105.43|
|Evaporative Heating Surface/Cylinder Volume||186.93||180.44||149.42||369.09||193.23|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||1661||1895||1854||1685||1699|
|Same as above plus superheater percentage||1661||1895||1854||1685||1699|
|Same as above but substitute firebox area for grate area||9594|