Gotthard Railway Ec 3/3
Switzerland 1897 12 produced
The Ec 3/3 was ordered when the shunting duties in large stations and yards grew. Numbers 301 to 306 were delivered by SLM in 1897, followed by 307 to 312 in 1901. With a service weight of 42.7 tonnes, they were the heaviest shunting locomotives in Switzerland at that time. They had drivers of 1,230 mm and cylinders which measured 380 mm in diameter and 600 mm in stroke. Their water tanks had a capacity of 4.5 tonnes and were sloped at the front to increase visibility. Although not designed for line service, they had an air brake and were equipped for steam heating.
Technical data
General
| Property | 301-306 | 307-312 |
|---|---|---|
| Built | 1897 | 1901 |
| Manufacturers | SLM | |
| Wheel arrangement | 0-6-0ST (Six-coupled) | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | 301-306 | 307-312 |
|---|---|---|
| Length | 8.20 m | |
| Wheelbase | 3.40 m | |
| Empty mass | 33.3 t | |
| Service mass | 42.7 t | |
| Adhesion mass | 42.7 t | |
| Rigid wheelbase | 3.40 m | |
| Water capacity | 4,500 l | |
| Fuel capacity | 1.8 t (coal) | |
Boiler
| Property | 301-306 | 307-312 |
|---|---|---|
| Grate area | 1.3 m² | |
| Firebox surface | 6.8 m² | |
| Tube heating surface | 73.96 m² | 72.1 m² |
| Evaporative heating surface | 80.76 m² | 78.9 m² |
| Total heating surface | 80.8 m² | 78.9 m² |
Power plant
| Property | 301-306 | 307-312 |
|---|---|---|
| Driver diameter | 1,230 mm | |
| Boiler pressure | 12 bar | |
| Expansion type | simple expansion | |
| Cylinders | two, 380 x 600 mm | |
Power
| Property | 301-306 | 307-312 |
|---|---|---|
| Power source | steam | |
| Indicated power | 294 kW (400 PS) | |
| Top speed | 60 km/h | |
| Starting effort | 71.8 kN | |
Calculated values
| Property | 301-306 | 307-312 |
|---|---|---|
| Factor of adhesion | 1 : 5.83 | |
| Optimal speed | 26 km/h | |
| Power-to-weight ratio | 6.9 kW/t | |
| Heating Surface Equivalent | 114.8 m² | 112.9 m² |
| Cylinder volume/HSE | 1 : 1,185.90 | 1 : 1,205.44 |
| Adhesive weight/Total | 1 : 1.00 | |
| Tractive force/Heating surface | 1 : 18.58 | 1 : 19.02 |
| Grate area/Heating surface | 1 : 62.12 | 1 : 60.69 |
| Firebox/Tube surface | 1 : 10.88 | 1 : 10.60 |
