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Mexican State Railway class QR-1
The last steam locomotives built in North America had actually been ordered by the NdeM of Mexico. 16 each came from ALCO-Schenectady and Baldwin in 1946. Although they were of the 4-8-4 wheel arrangement, they were i...
General
| Property | Mexican State Railway class QR-1Remove |
|---|---|
| Built | 1946 |
| Manufacturers | ALCO, Baldwin |
| Wheel arrangement | 4-8-4 (Northern) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Mexican State Railway class QR-1Remove |
|---|---|
| Wheelbase | 13.74 m |
| Rigid wheelbase | 5.56 m |
| Total wheelbase | 26.31 m |
| Service weight | 175.5 t |
| Adhesive weight | 108.9 t |
| Axle load | 27.2 t |
| Total weight | 285.5 t |
| Water capacity | 56,781 l |
| Fuel capacity | 22,712 l (oil) |
Boiler
| Property | Mexican State Railway class QR-1Remove |
|---|---|
| Grate area | 7.181 m² |
| Firebox surface | 40.599 m² |
| Tube heating surface | 348.201 m² |
| Evaporative heating surface | 388.8 m² |
| Superheater surface | 159.886 m² |
| Total heating surface | 548.7 m² |
Power plant
| Property | Mexican State Railway class QR-1Remove |
|---|---|
| Driver diameter | 1,778 mm |
| Boiler pressure | 17.6 bar |
| Expansion type | simple expansion |
| Cylinders | two, 635 x 762 mm |
Power
| Property | Mexican State Railway class QR-1Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,983 kW (4,056 PS) |
| Starting effort | 258.3 kN |
Calculated values
| Property | Mexican State Railway class QR-1Remove |
|---|---|
| Factor of adhesion | 1 : 4.14 |
| Optimal speed | 71 km/h |
| Power-to-weight ratio | 17.0 kW/t |
| Heating Surface Equivalent | 911.6 m² |
| Cylinder volume/HSE | 1 : 529.46 |
| Adhesive weight/Total | 1 : 1.61 |
| Tractive force/Heating surface | 1 : 9.83 |
| Grate area/Heating surface | 1 : 76.41 |
| Firebox/Tube surface | 1 : 8.58 |
| Total/Superheater | 1 : 2.43 |
