Thanks for the cord info Nick. That clears things up a bit. It may be possible to 3D print a suitable cord socket using ABS or polycarbonate which are somewhat heat resistant, or as Stoker suggested, I may have to "carve" one out of some suitable material. However, the initial connections will have to be much more primitive
I've spent some time researching this Marklin. Based on the following catalog pages, I believe it is a 1930 or earlier model EL4096. I am basing this on the round firebox windows/vents and 4 top ports on the boiler. It looks like after 1930 the firebox vents were rectangular, there were 5 boiler top ports, and the model changed to EL4097.
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Images (translated by Google) from historical Marklin Catalogs available at:
www.lctm.info/Secciones/Trenes/Biblioteca/Catalogos/index.phpHappy Steaming!