So i've been experimenting with .tbumptex material in TRS19.
I took the 386 model as example (386 011-1) and generated a normal map for it. Specular map is included (located in the alpha channel of the normal map).
I made this normal map very, very quickly just to demostrate the effect. So it can look like crap somewhere.
So, on the screenshot: loco on the left - with standart .onetex material; loco on the right - with .tbumptex (normal + specular). As you can see here and in the attached video, specular brings life to the model - light level changes during rotation and moving.
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I found some eccouraging things. For example, tbumptex material is simulated with PBR - color on the specular map will be shared between two pseudo-PBR maps. And that specular map will be set as roughness and in the same time as metallic map. TL;DR: the more white is specular map - the more metallic it will get.
I also made a short upgrade instruction. To perform it, you will require any grapic editor, any normal map generator and IM Editor.