The yard, the SCRAP IRON kingdom

I wrote in a previous post some sentences about  yard, but the yard deserves its own post, in fact if you're a student of the history of the technology, you can write not a post, a complete blog about the yard. Like a paleontologist experience the joy of discover, classify and match bones, guessing the animal, the era, the function and so on, enter in the yard of the school transport you to another era, maybe the era when the oil was not oil but alive creatures.
Nothing matches, machines and structures are pull and push together.
An engine is close to a gear box. The engine have a hydraulic power system and the gear box needs a mechanical power entry  but is not really important because the engine can´t work, neither the gear box.
The gear box is close to a simulation of substructure, not too far away there are a vertical mast that is not a drilling mast.
A mast, with the monkey board close to it. unfortunately this mast is horizontal and probably will continue in the same position the next 25 years.
The Queen of the museum, the only bunch of pieces that works are the tong simulator. An 1960/70 piece that nobody continues using, but when using, you think that you are in the kind of ring you see on old fashioned Tv. films.

Engine, gear box with drawwork and substructure (the only thing in common is the color)  In front of those museum pieces a blue bit, XX century master piece

Masts. in red, travel block, and mud pipe (beyond the mast, the crown block in red too)