Minho e Douro Articulated Locomotives in Portugal

Class Details by Steve Llanso of Sweat House Media

Class E 164 (Locobase 6395)

Data from [], the website of the Swiss rail preservation group La Traction.

According to La Traction, these Mallets came to the M e D over a three-year period. Operational experience showed them to be overweight when compared with other metre-gauge. Still they remained in service for decades, receiving their final set of numbers when the national railway (CP) was formed in 1947.

La Traction's example was shut down in Portugal in 1984. Google's uncertain translation is ambiguous, but E 164 was transferred in some way from Portugal to Delemont where it was on display for years. Restoring it to running condition took years and a fortuitous grant from the Federation d' impulsion economique regionale (FIER). Shops in Meiningen put the E 169's rear engine set under a new steel boiler and installed a compressed-air brake system. Even then, light-off showed that the injectors wouldn't work above a 10-bar pressure and the brake system leaked. Some of the bearings failed as well. Eventually all was worked through and the locomotive entered regular museum service in 2000.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassE 164
Locobase ID6395
RailroadMinho e Douro
Number in Class10
Road NumbersE 161-170
Number Built10
BuilderHenschel & Sohn
Valve GearHeusinger
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)17.06 / 5.20
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)17.06 / 5.20
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)92,594 / 42,000
Engine Weight (lbs / kg)92,594 / 42,000
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)92,594 / 42,000
Tender Water Capacity (gals / ML)924 / 3.50
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.40 / 1
Minimum weight of rail (calculated) (lb/yd / kg/m)39 / 19.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)43.30 / 1100
Boiler Pressure (psi / kPa)203.10 / 14
High Pressure Cylinders (dia x stroke) (in / mm)12.6" x 21.65" / 320x550
Low Pressure Cylinders (dia x stroke) (in / mm)18.9" x 21.65" / 480x550
Tractive Effort (lbs / kg)18,974 / 8606.47
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.88
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)11.78 / 3.59
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)14.31 / 1.33
Evaporative Heating Surface (sq ft / m2)887 / 82.40
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)887 / 82.40
Evaporative Heating Surface/Cylinder Volume283.89
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2906
Same as above plus superheater percentage2906
Same as above but substitute firebox area for grate area
Power L1
Power MT

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