I find this photograph to be very intriguing. Construction techniques and civil engineering have come so far in the modern era that it's fun to look at how things used to be. But beyond the fascinating indivudual elements in this photo is the question of what is actually being built? If you have a thought, please comment below!
Below, since all the heavy equipment in the day was steam powered, cartfuls of coal were needed to stoke the fires. In the background of this crop appears to be a steam-powered concrete mixer.
From the output of the mixer, three cement carts can be seen sitting on a make-shift bridge leading to the project.
A large steam shovel - looking more like a building than a piece of movable equipment - works at digging.