Lyon-Mediterranee 2-2-2 Locomotives in France


Class Details by Steve Llanso of Sweat House Media

Class 155 (Locobase 13360)

Data from the PLM Wiki vault crammed with data and plans at [], last accessed 3 November 2011. The plan comes from the 1869 PLM plan book collected by Roland Sermet. (Thanks to Teemu Koivumaki for his 31 January 2021 email noting the works numbers for all but 206-207). Works numbers for 155-168 were 937-950 in 1855 (road numbers 51-64).

The southern half of what would become the PLM bought these small "English express" locomotives (Express anglaises) 51 : BorTe, 52 : Ouragan, 53 : Simoun, 54 : Tempte, 55 : Autan, 56 : Siroco, 57 : Foudre, 58 : Ariel, 59 : Bradamante, 60 : Rabica, 61 : Bride d'or, 62 : Rodemont, 63 : Hippogriffe, 64 : Emperor, 65 :Narphise, 66 : Etincelle

NB: The boiler pressure setting is an estimate.


Class 67 / 120 91 (Locobase 13361)

Data from the PLM Wiki vault crammed with data and plans at [], last accessed 3 November 2011. The plan comes from the 1869 PLM plan book collected by Roland Sermet

The LM decided to add to its stock of small "English express" locomotives (Express anglaises), but built the next decade in its own shops. The railway increased the dimensions both in the boiler and in the cylinders.

67 : Euryale, 70 : PTgase, 73 : Emeraude, 68 : Amphitrite, 71 : Perle, 74 : Topaze, 69 : Bacchante, 72 : Rubis, 75 : Saphyr, 76 : AmTthyste

The entire class would be converted to 2-4-0s at the Paris-Lyon shops in 1873-1874; see Locobase 14409

NB: The boiler pressure setting is an estimate.

Principal Dimensions by Steve Llanso of Sweat House Media

Class15567 / 120 91
Locobase ID13360 13361
RailroadLyon-Mediterranee (PLM)Lyon-Mediterranee (PLM)
CountryFranceFrance
Whyte2-2-22-2-2
Number in Class5310
Road Numbers155-207 / 51-6667-76 / 120 91-120 100
GaugeStdStd
Number Built5310
BuilderRobert Stephenson & CoLM-Nimes
Year18551858
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)15 / 4.5714.99 / 4.57
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)26,455 / 12,00026,455 / 12,000
Weight on Drivers (lbs / kg)26,455 / 12,00026,455 / 12,000
Engine Weight (lbs / kg)58,312 / 26,45060,693 / 27,530
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)44 / 2244 / 22
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)73.40 / 186573.40 / 1865
Boiler Pressure (psi / kPa)116 / 8116 / 8
High Pressure Cylinders (dia x stroke) (in / mm)14.96" x 20" / 380x50815.75" x 20" / 400x508
Tractive Effort (lbs / kg)6013 / 2727.456665 / 3023.20
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.40 3.97
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm) - 5.039" / 128 - 5.039" / 128
Flue/Tube length (ft / m)11.09 / 3.3811.09 / 3.38
Firebox Area (sq ft / m2)76.96 / 7.1582.24 / 7.64
Grate Area (sq ft / m2)
Evaporative Heating Surface (sq ft / m2)876 / 81.371028 / 95.50
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)876 / 81.371028 / 95.50
Evaporative Heating Surface/Cylinder Volume215.30227.94
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation
Same as above plus superheater percentage
Same as above but substitute firebox area for grate area89279540
Power L143974529
Power MT366.42377.42

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