SB/DV Mori-Arco-Riva am Gardasee 0-6-2 Locomotives in Austria

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 6354)

Data from Sebastian's Homepage [] (visited 17 Nov 2004). See also "Union Pacific Powers One of Zoo's Rarest Treasures" on the Omaha Zoo Foundation's website at, posted on 13 April 2015, last accessed 3 October 2020. Works numbers were 2359-2361 in 1891 and 2709 in 1892.

Similar to the SKGLB/StLB batch (Locobase 6353) and delivered in the same period, these Mori Arco Riva engines had widely varying careers. Not much is known about the fates of #1 Arco and #4 Pinzolo. #3 Lago di Garda wound up with a Yugoslavian class ID JDZ 183-001.

#2 - Riva - was the most widely traveled. Sent to Poland in 1918 as reparation and put in the XIV class. World War II saw the locomotive first in Soviet hands, then German. The Reich sent it to Hungary, whose state railway MAV gave it a class ID of 395 (#104). Later in World War II, Riva fell into Romanian service with the same ID. In 1968, the CFR sold Riva to Plasser & Theurer of Vienna, where, having completed the circle, Riva seemed likely to end its days.

Most implausibly of all, however, Omaha, Nebraska's Henry Doorly Zoo railroad received 395 as a donation (a joint project of P & T and the Union Pacific) in 1974, reconditioned it, converted the long-lived survivor to oil burning and put it into service in 1976. In the 2015 article, Riva's caretakers assessed her strengths and weaknesses: "She has a powerful engine, but was not built for curves. Simmons describes her as 'classy, but stiff' and recalls a time when she derailed in slow motion on her inaugural run and it took six hours to get her back on track. Once again, UP stepped in, helping the zoo make extensive modifications to the engine and the tracks to adapt Riva to her new home."

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID6354
RailroadSB/DV Mori-Arco-Riva am Gardasee
Number in Class4
Road Numbers1-4
Number Built4
BuilderKrauss Linz
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.92
Engine Wheelbase (ft / m)13.08
Ratio of driving wheelbase to overall engine wheelbase 0.53
Overall Wheelbase (engine & tender) (ft / m)13.08
Axle Loading (Maximum Weight per Axle) (lbs / kg)13,228 / 6000
Weight on Drivers (lbs / kg)39,683 / 18,000
Engine Weight (lbs / kg)50,927 / 23,100
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)50,927 / 23,100
Tender Water Capacity (gals / ML)700 / 2.65
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)22 / 11
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)32.30 / 820
Boiler Pressure (psi / kPa)174 / 12
High Pressure Cylinders (dia x stroke) (in / mm)11.42" x 15.75" / 290x400
Tractive Effort (lbs / kg)9405 / 4266.04
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.22
Heating Ability
Tubes (number - dia) (in / mm)97 - 1.732" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.01 / 3.05
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2) 8.61 / 0.80
Evaporative Heating Surface (sq ft / m2)469 / 43.60
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)469 / 43.60
Evaporative Heating Surface/Cylinder Volume251.18
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1498
Same as above plus superheater percentage1498
Same as above but substitute firebox area for grate area
Power L1
Power MT

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