SBB-CFF-FFS B 3/4
1701-1747 (wet vapor composite )
The B 3/4 was a steam locomotive of the Swiss Federal Railways ( SBB).
General
The Swiss Federal Railways ( SBB) B had made from 1904 to 1907, the 3 Series / 4 of the three-cylinder wet steam locomotives with the wheel arrangement composite 1'C in service. There were 47 machines of this type, they led the running numbers 1701 - 1747th They were designed for an operating pressure of 14 bar, depending showed a high and two low-pressure cylinders of the same size and a crank offset of 120 degrees. Another peculiarity consisted in the two-axle, high and low pressure cylinders of this Verbundloks worked on two different axes. Their main area was the Jura - Simplon railway.
The SBB also decided to procure a series of such after successful tests with superheated steam locomotives. The Train Locomotive had a vapor pressure of 12 bar low.
Beginning in 1885, all major Swiss private railways for universal use procured appropriate Tender locomotives of the type B 3 /4 ( " Mogul " ) in different versions. The young State Railways SBB needed to meet their additional needs a simplified development of until 1905 further built under SBB regime three-cylinder type, the Jura -Simplon -Bahn (JS ), but in the version with two-cylinder engine and a simple steam expansion. As the first SBB locomotive this series B 3/4 was already equipped with superheaters upon delivery of the system Schmidt. The resulting much higher steam temperature up to 350 ° C caused the initial application of piston valves instead of the usual flat slide. The smaller because of the spool forces for the slider control allowed a slightly lighter rod for control. To improve the run curve the leading run- axis and the first drive axle were combined to form a combined bogie type Helmholtz Winterthur. Inventories of supplies were carried in a three-axle Tender. With its simple structure and good performance, this type of locomotive proven in the middle passenger and freight use and distinguished himself also by economic fuel consumption.
The SBB left 69 pieces of B 3/4 build. Today 1367 Historical Foundation at the legacy of the SBB (SBB Historic) is the No. ready.
Dampfturbinenlok 1801
A locomotive of this series was 1920/21 rebuilt to plans by Heinrich Zoelly to Dampfturbinenlok. For this they received a second pusher axle ( 2'C ). The turbine speed was up before the smoke chamber, the dummy shaft for the drive was mounted in place of the cylinder front under the circulation. There were many test drives and conversions. Despite the general suitability of the locomotive was scrapped because of the route electrification in 1943.