Set “The big train” vintage LGB toy train

Construction train set produced by LGB (Lehmann-Gross-bahn) in G scale from the ’80s.
The package includes some tracks, the diesel locomotive, the crane car, the flatcar or freight car, and the transformer.
The box shows significant signs of age as seen in the photos, while the cars/locomotive are in good condition.
It has not been tested, so its functionality is to be checked.
Average car dimensions 25 x 12 height 20