This small class of Mikado tanks was delivered over a three-year period by Hannoversche Maschinenbau of Germany (the first 8 - 761-768) and the two Tampere builders -- Tampere Pellava-ja Rautateollisuus OY (Tampella) supplying just the 769 and 770 in 1926 and Lokomo OY adding the last 6 (771-776) in 1925-1926.
Markku Karvonen's site shows that Tampere Pellava-ja Rautateollisuus OY (Tampella) of Tampere supplied 1030-1054, 1089-1096
Lokomo OY also of Tampere produced 1055-1060 and 1081-1088 in 1953-1955.
Arnold Jung of Jungenthal in Germany contributed one batch of 20 (1061-1080) in 1953.
Photographs in Ziel and Eagleson (1973) show the Tr1s to have had slender, tapered main and side rods and spoked drivers like the Hr1s, but their "elephant-ear" smoke lifters were much bigger. The steam dome and sandbox were gathered into one long casing (to keep the sand from freezing may have been one reason) and the engine crew benefited from a vestibule cab. Like the Hr1s, these modern engines saw out steam on the VR.
Data from Markku Karvonen's personal.inet.fi/koti/markku.karvonen/prk/vanha3.htm (visited 29 March 2003). (Adhesion weight data from [external link] ...)...
|Principal Dimensions by Steve Llanso of Sweat House Media|
|Number in Class||16||67||2|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)|
|Engine Wheelbase (ft / m)||25.66 / 7.82|
|Ratio of driving wheelbase to overall engine wheebase|
|Overall Wheelbase (engine & tender) (ft / m)||25.66 / 7.82|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)||33,510 / 15,200||17,637 / 8000|
|Weight on Drivers (lbs / kg)||130,073 / 59,000||149,915 / 68,000||70,548 / 32,000|
|Tender Loaded Weight (lbs / kg)|
|Total Engine and Tender Weight (lbs / kg)||194,447||99,208|
|Tender Water Capacity (gals / ML)||1426 / 5.40|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||54 / 27||62 / 31||29 / 14.50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||63 / 1600||63 / 1600||44.10 / 1120|
|Boiler Pressure (psi / kPa)||174 / 12||217.60 / 15||142.10 / 9.80|
|High Pressure Cylinders (dia x stroke) (in / mm)||22.44" x 25.59" / 570x650||24.02" x 27.56" / 610x700||16.93" x 20.08" / 430x510|
|Tractive Effort (lbs / kg)||30,251 / 13721.64||46,683 / 21175.08||15,763 / 7149.99|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.30||3.21||4.48|
|Firebox Area (sq ft / m2)|
|Grate Area (sq ft / m2)||22.70 / 2.11||38.09 / 3.54||15.18 / 1.41|
|Evaporative Heating Surface (sq ft / m2)||1313 / 122.03||2103 / 195.45||869 / 80.70|
|Superheating Surface (sq ft / m2)||409 / 38.01||732 / 68.03||196 / 18.20|
|Combined Heating Surface (sq ft / m2)||1722 / 160.04||2835 / 263.48||1065 / 98.90|
|Evaporative Heating Surface/Cylinder Volume||112.09||145.49||166.10|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||3950||8288||2157|
|Same as above plus superheater percentage||4898||10,443||2545|
|Same as above but substitute firebox area for grate area|