Est 501 to 562

The first series Est 501–510 was built 1878–1879 at the workshops of the Chemins de fer de l'Est in Épernay.^[1] The general design of the frame was carried over from the earlier Crampton locomotives, but with an additional coupled axle replacing the second leading axle. The first few machines had a round-top firebox which protruded down between the two driving axles,^[2] while the later machines of this series had a Belpaire firebox which extended over the second coupled axle.^[3] The boiler tubes had a length of 3.5 m (11 ft 5+3⁄4 in) and the steam regulator was of the Crampton type with the steam pipes running down to the cylinders externally.^[4] The Cylinders were placed horizontally on both sides between the double longerons of the frame with the connecting rod directly driving the second driving axle. The driving wheels had a diameter of 2,310 mm (7 ft 7 in).^[4]

The second series, comprising Est 511–542, was built in 1881–1882^[5] in two subseries at Cail (1881) and Wiener Neustadt (1882).^[6] The diameter of the driving wheels was reduced to 2,110 mm (6 ft 11+1⁄8 in), and also the firebox was changed to one with a rounded top which also extended over the second coupled axle.^[5] The reversing mechanism of the Gooch valve gear was rearranged.^[2] Also the cylinder size was reduced to 430 mm × 610 mm (16+15⁄16 in × 24 in) on the machines Est 523-542.^[5][2]

The third and last series, Est 543–562, was built 1884–1885.^[2] The main differences compared to the preceding Est 523-542 series was the lengthening of the boiler and boiler tubes, which now had a length of 4.1 m (13 ft 5+3⁄8 in).^[2] Also the cylinder size had been increased to 440 mm × 610 mm (17+5⁄16 in × 24 in).^[5]

In 1888, two locomotives of the first series, Est 508 and 509, were fitted experimentally with dual drum Flaman boilers with a boiler pressure of 12 kg/cm² (1.18 MPa; 171 psi).^[5] Due to the increased weight the leading axle had been replaced by a two-axle outside-frame bogie. Although these machines apparently did not meet the expectation, they still remained in service until 1925.^[5]

In order to increase the available traction, 48 locomotives of the series 511–562 had their driving wheels reduced from 2.11 m (6 ft 11+1⁄8 in) diameter down to 1.85 m (6 ft 7⁄8 in), which was sufficient to pull the local trains on the main and secondary lines. The locomotives were also renumbered to the range 2511–2562.^[5]

The series Est 501–510 used a two-axle tender with a capacity of 10 m³ (350 cu ft) water and 2.5 t (5,510 lb) coal and weighing a total of 24 t (52,900 lb), while the series Est 543–562 used a two-axle tender with a capacity of 13 m³ (460 cu ft) water and 3 t (6,610 lb) coal and weighing a total of 29 t (63,900 lb).^[5]

Wikimedia Commons has media related to Est 501 to 562.

• Vilain, Lucien-Maurice (1980). L'Évolution des locomotives à vapeur de la compagnie des chemins de fer de l'Est 1853-1938 (in French). éditions Pygmalion. ISBN 2-85704-081-4.
• Demoulin, Maurice (1898). Traité pratique de la machine locomotive (in French). Vol. 1. Baudry et Cie.
• Deghilage (2 August 1879). "Locomotives a grande vitesse de l'Exposition Universelle de 1878". Revue générale des chemins de fer (in French). 2, 2e Semestre. Paris: P. Vicq-Dunod: 81–108. OCLC 6536095.
• Deghilage (4 October 1882). "Note sur les locomotives construites pour les Chemins de fer français, De 1878 à 1881 - Première partie". Revue générale des chemins de fer (in French). 5, 2e Semestre. Paris: P. Vicq-Dunod: 237–265. OCLC 6536095.

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