Electric-steam locomotive

An electric locomotive is a special form of the steam locomotive, in which the heating of the boiler water is electrically.

Two such locomotives (SBB ) were used in shunting because they had coal shortage and lack of electric locomotives in World War II at the Swiss Federal Railways. The electric steam locomotive can - if you boiler is heated - even up to 20 minutes without energy supply, such as driving a fire loose steam locomotive.

History and organization

The two locomotives were converted from existing Rangierdampflokomotiven E 3/ 3 " Tigerli ". There were number 8521 and 8522nd The locomotives of the SBB received two electric evaporator, each of which was fed by an associated transformer. The current collector was located on the roof, the oil main switch ahead of the cab on the boiler. The two transformers and the evaporator were located on both sides of the circular plate. The boiler water was taken at the lowest point of the tank and driven with circulating pumps through the evaporator. The vapor was then fed back from the evaporator in the vapor dome. The flow rate was 5 l / sec, while the hourly quantity of steam generated 300 kg and 12 cash per evaporator ( together 600 kg ). Since the heating current was passed directly through the heating pipes, the voltage was limited to around 20 volts.

The power of the transformer was 480 kVA. By heating pipes flowed a stream of about 12,000 A. The regulation was carried out by Desserts of water by means of injectors or by interrupting the power supply. The circulation pumps are supplied with direct current of 36 volts from a normal car battery, which in turn via a rectifier - loaded - which was connected to a transformer. The whole electrical device weighed seven tons, which necessitated a strengthening of the suspension springs. The actual firing was not altered, and usually a small coal fire was obtained to serve also catenary -free tracks longer than 20 minutes can. Despite this, the savings in coal was 700-1200 kg per day or approximately 300 tons per year (300 tons corresponds to a war worth 36,000 francs). A further positive side effect of the electric steam generation was that a cold engine heated up within an hour and was ready for use. The conversion costs were approximately 100,000 francs per locomotive.

Were used, the locomotives in Zollikofen ( 8521 ) and Brig ( 8522 ). The electrical equipment was removed in 1951 again. While the 8521 was discontinued in 1963, the 8522 came out in 1964 on Sursee - Kulmerau train and still exists today.