Erie class N-1
United States 1911 155 produced
To accelerate heavy freight trains, the Erie Railroad ordered 20 class N-1 locomotives from Baldwin in 1911, which were the heaviest Mikados at the time. Since this design was a success, a total of 135 more were ordered, which were also manufactured by ALCO-Schenectady and by Lima. The boiler pressure of the individual locomotives was between 170 and 200 psi.
From 1927 the locomotives were rebuilt, adding a feed water heater, removing some tubes in the boiler and setting the pressure uniformly at 190 psi. Many received a mechanical stoker, but at least 50 remained hand-fired. Almost all were scrapped between 1947 and 1951, few were sold.
Technical data
General
| Property | as built | rebuilt |
|---|---|---|
| Built | 1911-1913 | 1927-1941 |
| Manufacturers | ALCO, Baldwin, Lima | |
| Wheel arrangement | 2-8-2 (Mikado) | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | as built | rebuilt |
|---|---|---|
| Wheelbase | 10.67 m | |
| Total wheelbase | 20.38 m | 20.45 m |
| Service mass | 149.1 t | |
| Adhesion mass | 107.5 t | 105.6 t |
| Total mass | 230.8 t | |
| Rigid wheelbase | 5.03 m | |
| Axle load | 27.9 t | |
| Water capacity | 34,069 l | |
| Fuel capacity | 14.5 t (coal) | |
Boiler
| Property | as built | rebuilt |
|---|---|---|
| Grate area | 6.503 m² | |
| Firebox surface | 24.434 m² | |
| Tube heating surface | 365.945 m² | 356.841 m² |
| Evaporative heating surface | 390.379 m² | 381.274 m² |
| Superheater surface | 81.476 m² | 78.317 m² |
| Total heating surface | 471.9 m² | 459.6 m² |
Power plant
| Property | as built | rebuilt |
|---|---|---|
| Driver diameter | 1,600 mm | |
| Boiler pressure | 11.7 bar | 13.1 bar |
| Expansion type | simple expansion | |
| Cylinders | two, 711 x 813 mm | |
Power
| Property | as built | rebuilt |
|---|---|---|
| Power source | steam | |
| Estimated power | 2,051 kW (2,789 PS) | 2,237 kW (3,041 PS) |
| Starting effort | 256.0 kN | 286.1 kN |
Calculated values
| Property | as built | rebuilt |
|---|---|---|
| Factor of adhesion | 1 : 4.12 | 1 : 3.62 |
| Optimal speed | 48 km/h | |
| Power-to-weight ratio | 13.8 kW/t | 15.0 kW/t |
| Heating Surface Equivalent | 675.5 m² | 660.1 m² |
| Cylinder volume/HSE | 1 : 956.01 | 1 : 978.34 |
| Adhesive weight/Total | 1 : 1.39 | 1 : 1.41 |
| Tractive force/Heating surface | 1 : 11.33 | 1 : 13.00 |
| Grate area/Heating surface | 1 : 72.56 | 1 : 70.67 |
| Firebox/Tube surface | 1 : 14.98 | 1 : 14.60 |
| Total/Superheater | 1 : 4.79 | 1 : 4.87 |
