The Nord 2.821 to 2.911 and 2.201 to 2.212, also referred to as Outrances, was a series of French 2-4-0 and 4-4-0 express passenger locomotives of the Chemins de Fer du Nord.
Construction history
Nord 120 2.834 - 2.860.
The first series, Nord 2.821–2.832, designed by L. Beugniot as 2-4-0 locomotives, was built by André Koechlin & Cie in Mulhouse in 1870–1871.[1]
The locomotive had a double frame with two driving axles and a leading axle which had a clearance of 10 mm (0.39 in) on each side.[2]
The firebox had an arced top and sat between the two driving axles.
The tubes had a length of 3.17 m (10.4 ft) and the boiler barrel consisted of two boiler shells, with a boiler pressure of 8.5 kg/cm2 (0.834 MPa; 121 psi).
The dome was placed centrally on top of the firebox and a Crampton-type steam regulator was placed on the extreme front of the first boiler shell.
The cylinders were installed horizontally without inclination inside of the frame and had a Stephenson valve gear.
The two-axle tender used had a capacity of 8 m3 (280 cu ft) water and 3 t (6,610 lb) coal and weighed a total of 21.6 t (47,600 lb).
In 1873 Édouard Delebecque modified the design. A Belpaire firebox which extended over the rear driving axle was installed.[1]
The tubes were lengthened to 3.55 m (11.6 ft) and the dome was moved slightly forward to the front on top of the firebox.
A single machine, the Nord 2.833, was built in 1873.[3]
From 1875 to 1877 the next series, Nord 2.834–2.860, was built by the Société Alsacienne de Constructions Mécaniques (SACM) at Mulhouse with only minor differences.[1]
The dome was moved forward to the rear end of the second boiler shell, just in front of the firebox.[3]
Also a three-axle tender of 14 m3 (490 cu ft) water and 4 t (8,820 lb) coal, weighing 33 t (72,800 lb), was used.
In the following series, Nord 2.861–2.911, which was built in 1877–1879, the leading axle was replaced by a 2-axle bogie pivoting around a fixed point in the frame.[1][3]
Also the boiler pressure was increased to 10 kg/cm2 (0.981 MPa; 142 psi).
The last series was built in the years 1884 to 1885 and comprised the twelve locomotives Nord 2.201–2.212, which had a leading radial axle instead of the 2-axle bogie.[1]
Over time various modifications were done on the machines.
All machines with a single leading axle received leading 2-axle bogies with lateral movement, the Nord 2.821–2.833 in 1890–1892, the Nord 2.834–2.860 in 1894–1898 and the Nord 2.201–2.212 in 1891–1892.[1]
Additionally a Belpaire firebox was installed on most of the Nord 2.821–2.832 series, a spherical dome was mounted on top of the boiler barrel, and the boiler pressure was increased to 10–11 kg/cm2 (0.981–1.08 MPa; 142–156 psi).
In 1885–1890 the locomotives of the series Nord 2.833–2.860 also had their boiler pressure increased to 8.5–10 kg/cm2 (0.834–0.981 MPa; 121–142 psi) and Nord 2.847, 2.850 and 2.851 to 11 kg/cm2 (1.08 MPa; 156 psi).[1]
Some of the machines, called Outrances renforcées, also received cylinders with an increased size of 460 mm × 610 mm (18+1⁄8 in × 24 in).[1]
