Hey Shaygetz, you almost got my youth in your Marklin box. No, I didn't have a Märklin RR (we had no money for such a thing then), but a friend of mine had. And your pics look if this box could be from him!
The loco is a passenger train loco of the Deutsche Bundesbahn (German Federal Ry), Serie 01 - the fastest and most elegant steamers right after WW II. Among the passenger cars I noted the dark red MITROPA restaurant car and the dark green coaches used for long distance passenger trains. Because of the tight curve radius they were proportionally shortened about one third.
Yes, David is right with the track. I think it must have been around 1960 when Marklin offered the new 'stud' track with 'invisible' third center rail.
The tin-trackbed stuff you have was called 'M-track' (M for model) as opposed to the later K-track (K = Kunststoff = plastics) with simple ties and without the ballasted trackbed.
I remember that it always was great fun, when my friend had put up his Marklin RR on the floor of his room. We were about four boys who 'played with trains'. And it was a joke that we pushed the reverser button on the transformer (which gave a 25 V spike on the track to actuate the reverser relais) whenever somone had his hands on the track. The 25 Volts were enough for quite a nasty shock, especially when we had sweaty hands!
Just take care to that stuff, Shaygetz. I think it is quite valuable. And as you said - the quality of these models is outstanding!
Ron