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Prussian T 15
Germany | 1897 | 117 produced
No. 1900 on a Henschel works photo
No. 1900 on a Henschel works photo

The T 15 was developed to replace the three-coupled locomotives that had reached their limits on the mountain routes in Thuringia and Silesia. The list of requirements included that a load of 200 tonnes could still be pulled at a speed of at least 15 km/h on inclines of 3.3 percent and curve radii of 200 meters. Significantly more power was required in the tight corners than would have been necessary for the same incline on the straight.

In order to achieve the necessary ability to negotiate curves, an unusual, split chassis with only one common pair of cylinders was used. The front three coupled axles sat firmly in the frame and were driven like a conventional six-coupled. The two rear axles sat in a bogie and were driven by the front coupling rods via a lever system. Although this design involved greater maintenance, the locomotives were able to live up to expectations.

Schematic representation of the mechanics according to the Hagans system
Schematic representation of the mechanics according to the Hagans system
Locomtoive Magazine, July 1903

The design came from the Christian Hagans machine factory in Erfurt and was ready for series production in 1897. Since they usually produced smaller locomotives there and did not have the sufficient capacity for larger numbers of a locomotive of these dimensions, production was handed over to Henschel. Thus, between 1897 and 1905, a total of 92 examples of this type were created. At about the same time, 29 examples of the four-axle T 13 of the Hagans design were also manufactured by Henschel.

With the idea of simplifying the engine, Professor Otto Koechy later developed the design named after him, which reduced the number of components through a design with rocker arms. Despite the practical approach, only one example of this design was made, since the more powerful T 16 with the much simpler chassis according to Gölsdorf was already being produced from 1905.

Due to the superiority of the T 16, the T 15 could not achieve a very long service life. None of them received a Reichsbahn number, as they were all retired by 1923. The one-off continued to be used, but was decommissioned in 1922 at about the same time as its sisters.

General
Built1897-1905
ManufacturerHenschel
Axle config0-10-0T (Ten-coupled) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length39 ft 0 7/8 in
Wheelbase22 ft 6 1/16 in
Fixed wheelbase9 ft 0 1/4 in
Empty weight123,459 lbs
Service weight157,630 lbs
Adhesive weight157,630 lbs
Axle load31,526 lbs
Water capacity3,170 us gal
Fuel capacity4,409 lbs (coal)
Power
Power sourcesteam
Estimated power603 hp (450 kW)
Optimal speed12 mph
Top speed25 mph
Starting effort32,542 lbf
Power Plant
Driver diameter47.2 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 20 1/2 x 24 13/16 in
Boiler
Grate area25.4 sq ft
Firebox area90.2 sq ft
Tube heating area1,390.1 sq ft
Evaporative heating area1,480.3 sq ft
Total heating area1,480.3 sq ft
Calculated Values
steam locomotive
freight
tank locomotive
last changed: 01/2022
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