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Swiss Central Railway D4T
Swiss Federal Railways D 2x2/2
Switzerland | 1897 | 12 produced
No. 179 in the SLM type sheet
No. 179 in the SLM type sheet
SBB Historic

After the Mallet tank locomotives later known as Ed 2x2/2, the SCB had twelve more tender locomotives built, which were initially designated as the D4T. They had the same cylinder size as their predecessors, but a larger boiler thanks to the elimination of supplies onboard the locomotive. They were used on the Hauenstein line between Basel and Olten and were later designated D 2x2/2 by the SBB.

The maximum towing capacity on a ramp of one percent was 550 tonnes and on the Hauenstein, between 180 and 260 tons could now be towed on its 2.63 percent. The water supply was now almost twice as large as that of its predecessors and the coal supply of four tonnes was twice as large as that of the first series of the Ed 2x2/2.

As early as 1904, conventional locomotives of the type C 4/5, which also had a four-cylinder compound engine, were used on the Hauenstein. The D 2x2/2 were now used on other lines and retired between 1923 and 1926.

General
Built1897-1900
ManufacturerSLM
Axle config0-4-4-0 (Four Coupled Mallet) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Empty weight114,640 lbs
Service weight125,663 lbs
Adhesive weight125,663 lbs
Total weight193,566 lbs
Water capacity3,434 us gal
Fuel capacity8,818 lbs (coal)
Power
Power sourcesteam
Top speed34 mph
Starting effort23,804 lbf
with start valve28,565 lbf
Power Plant
Driver diameter50.4 in
Boiler pressure203 psi
Expansion typecompound
Cylindersfour, HP: 14 x 25 3/16 in
and LP: 21 5/8 x 25 3/16 in
Boiler
Grate area21.5 sq ft
Evaporative heating area1,415.5 sq ft
Total heating area1,415.5 sq ft
Calculated Values
steam locomotive
freight
Mallet
last changed: 08/2023
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