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French Northern Railway No. 2.641 to 2.675
French State Railway 2-221 A
| 1900 | 35 produced
Die Lokomotive, June 1904

The first series-built compound Atlantics of the de Glehn system were the locomotives of the French Nord, which were delivered from 1900. They were designed to maintain the speed of 200-tonne express trains at 100 km/h on 0.5 percent steep gradients, something the previous 4-4-0 machines could not achieve. Initially the prototypes 2.641 and 2.642 were created, as well as 33 series machines.

The de Glehn system, which later became widespread, especially in France, had separate valve gears and reversers for the high and low pressure cylinders. By keeping the wheel base of the driving axles as short as possible, the length of the coupling rods and the moving masses could be reduced. The tenders initially had a limited capacity due to the length of the turntables, but later tenders with up to 37 m³ of water were used.

They were able to easily exceed the required performances and reached speeds of up to 155 km/h during test runs. Approval was initially given for 120 and later 130 km/h and average speeds around 100 km/h were not uncommon. They later received superheaters and Lemaître blastpipes and became the 2-221 A at the SNCF. Their general design served as a model for many other locomotives.

Variantprototypesproduction
General
Built19001902-1904
ManufacturerSACMSACM, Fives-Lille, SFCM
Axle config4-4-2 (Atlantic) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase27 ft 10 5/8 in
Fixed wheelbase6 ft 11 7/8 in7 ft 0 5/8 in
Service weight138,891 lbs146,607 lbs
Adhesive weight71,617 lbs72,819 lbs
Total weight239,201 lbs
Axle load35,810 lbs36,409 lbs
Water capacity5,283 us gal5,019 us gal
Fuel capacity11,023 lbs (coal)8,818 lbs (coal)
Power
Power sourcesteam
Estimated power1,207 hp (900 kW)1,240 hp (925 kW)
Optimal speed47 mph49 mph
Top speed81 mph
Starting effort16,206 lbf
with start valve19,447 lbf
Power Plant
Driver diameter80.3 in
Boiler pressure232 psi
Expansion typecompound
Cylindersfour, HP: 13 3/8 x 25 3/16 in
and LP: 22 1/16 x 25 3/16 in
Boiler
Grate area29.5 sq ft
Firebox area164 sq ft166.8 sq ft
Tube heating area2,079.8 sq ft2,201.5 sq ft
Evaporative heating area2,243.8 sq ft2,368.4 sq ft
Total heating area2,243.8 sq ft2,368.4 sq ft
Calculated Values
steam locomotive
express
de Glehn Verbund
last changed: 02/2024
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