Tubize delivered 5 in 1908, Maffei 2 in 1912, and Tubize finished off the class with 3 in 1920.
Data from A E Durrant The Steam Locomotives of Eastern Europe (Newton Abbot:David & Charles, 1972). Works numbers were 1497-1499 and 1505-1506 in June 1935.
These were five of the 46 steam locomotives operated by the Thessaly Railways. Begun in 1882, the network came together in segments: From Volos, heading west then north 61 km (31 miles) to Larissa. The Volos line continued northwest from Velestinon northwest for 142 km (81 miles) to Kalampaka. Within this section the railway met the standard-gauge Athens-Larissa-Thessaloniki at Palaiofarsalos. This section had a maximum gradient of 3% between Velestinon and Aerinon.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | 20 | 30 |
| Locobase ID | 1534 | 1535 |
| Railroad | Thessalian Rwy | Thessalian Rwy |
| Country | Greece | Greece |
| Whyte | 2-6-2T | 2-6-2T |
| Number in Class | 10 | 5 |
| Road Numbers | 20-29 | 30-34 |
| Gauge | Metre | Metre |
| Number Built | 10 | 5 |
| Builder | several | Krupp |
| Year | 1908 | 1935 |
| Valve Gear | ||
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | ||
| Engine Wheelbase (ft / m) | ||
| Ratio of driving wheelbase to overall engine wheelbase | ||
| Overall Wheelbase (engine & tender) (ft / m) | ||
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | 60,480 / 27,433 | 62,720 / 28,449 |
| Engine Weight (lbs / kg) | 76,160 / 34,546 | 92,736 / 42,064 |
| Tender Loaded Weight (lbs / kg) | ||
| Total Engine and Tender Weight (lbs / kg) | 76,160 / 34,546 | 92,736 / 42,064 |
| Tender Water Capacity (gals / ML) | ||
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | ||
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 34 / 17 | 35 / 17.50 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 51.20 / 1300 | 51.20 / 1300 |
| Boiler Pressure (psi / kPa) | 174 / 1200 | 185 / 1280 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15.7" x 22" / 400x560 | 15" x 23.6" / 381x599 |
| Tractive Effort (lbs / kg) | 15,665 / 7105.53 | 16,309 / 7397.65 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.86 | 3.85 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | ||
| Flues (number - dia) (in / mm) | ||
| Flue/Tube length (ft / m) | ||
| Firebox Area (sq ft / m2) | ||
| Grate Area (sq ft / m2) | 11.80 / 1.10 | 13.50 / 1.25 |
| Evaporative Heating Surface (sq ft / m2) | 557 / 51.77 | 599 / 55.67 |
| Superheating Surface (sq ft / m2) | 178 / 16.54 | 235 / 21.84 |
| Combined Heating Surface (sq ft / m2) | 735 / 68.31 | 834 / 77.51 |
| Evaporative Heating Surface/Cylinder Volume | 112.99 | 124.10 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 2053 | 2498 |
| Same as above plus superheater percentage | 2546 | 3197 |
| Same as above but substitute firebox area for grate area | ||
| Power L1 | ||
| Power MT | ||