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Jean-Jacques Heilmann (1853-1922)
Born in Mulhouse, Alsace. He was a French engineer and inventor. He was the grandson of Joshua Heilmann.
1884 he invented a type of locomotive with steam-electric drive which became known as the Heilmann.
1890 Heilmann founded the Société Industrielle de Moteurs Électriques et à Vapeur.
1892/93 the first of these locomotives was built. It had a two-cylinder compound engine and electrical equipment by Brown, Boveri et Cie.
1897 he produced his second locomotive, No. the 8001, for the Compagnie des chemins de fer de l'Ouest. A similar locomotive, No. 8002 is said to have been built.
The above information is condensed from here.
No. 8001 had a conventional Belpaire boiler supplying a Willans high-speed vertical steam engine to drive the DC generators at 400 rpm. The exciter dynamo was driven by a small engine developing 18 kW at 550 rpm. The electrical equipment was once again supplied by Brown Boveri.
The locomotive made its initial test run on 12 November 1897. The entire weight was available for adhesion, and engine produced very little hammer blow.