Est 2-10-2 Locomotives in France

Class 151.TA.701 (Locobase 20493)

Data from diagram Type UG 186, Societe Alsacienne de Constructions Mecaniques from locomotive book supplied by Dany Machi up at [] as

Diagrammes des machines SACM construites a GRAFENSTADEN (October 2007). See also "New Tank Engines of the Eastern Railway of France", Railway Engineer, Volume 34, No 8 (August 1913), pp. 238-239, and a description of the Mestre superheater at p. 248. Works numbers were 7584, 7613

Tube and flue diameters are the external measurement. Interior diameters were 50 and 125 mm, respectively. As big as this locomotive looks in the diagram, there were several dozen designs that were bigger. Still, it was a large powerful machine suitable for hauling heavy mineral trains up the steep grades of the Longwy region. According to RE, the design was essentially a beefed-up version of the earlier 4401 class of 2-8-2T (Locobase 5109) with larger cylinders and connecting and coupling rods (North American main and side rods) were machined to an I-beam section.

Probably for trial purposes, a Mestre superheater was installed in one of the two and a Schmidt in the other. The Mestre dimensions appear in the specifications. Locobase studied the diagrams on p. 248 and thought of a skinny jellyfish. At the firebox end of each large-diameter (145-155 mm) flues was a header that held one end of five small tubes surrounding a large central tube. Saturated steam flowed from a smokebox collector down the central tube to the header. At the header the steam entered all five small tubes to flow back toward the collector.

Here's where the jellyfish (or perhaps Portuguese man of war) image appeared to Locobase. Each of the tubes' shape undulated up and down inside the central tube, resembling a writhing set of tendrils. (Locobase also thought of the Gorgon Medusa's hairdo of snakes; as jellyfish trail long threads of stingers, they are described as "medusas" so the analogy works either way.).

The engine using the Schmidt Type A unit had 125 small tubes each measuring 55 mm (2.16"), 14 more small tubes each 48 mm (1.875") in diameter and 24 large flues of 133 mm (1.88 mm). Superheater area came to 53.85 sq m (579.5 sq ft).

The pair served the Est and later the SNCF until 1959-1963.

Class Serie 13 /151TC (Locobase 15565)

Data from diagram Type UG 186, Societe Alsacienne de Constructions Mecaniques from locomotive book supplied by Dany Machi up at [] as

Diagrammes des machines SACM construites a GRAFENSTADEN (October 2007). See also "New Tank Engines of the Eastern Railway of France", Railway Engineer, Volume 34, No 8 (August 1913), pp. 238-239. Works numbers were 7584-7613

Tube and flue diameters are the external measurement. Interior diameters were 50 and 125 mm, respectively. As big as this locomotive looks in the diagram, there were several dozen designs that were bigger. Still, it was a large powerful machine.