Here we have a steam turbine, which uses the power of boiling water to produce electricity. At one time they powered a huge range of transport, including trains and ships, and covered vast distances. In fact they made much of our modern transport concievable and possible.
In many ways we still use this power, but much more refined, and without the wastage that used to occur. Also, we no longer produce it through fossil fuels like coal and its derivatives. Nor are there huge pistons, cylinders and levers. Modern turbines are more like wheels, or like the sails of a windmill, with rotors rather than pistons and curving blades that efficiently gather the energy.
Now this is another card which we usually encounter in a different form, for this is the standard W.D. & H.O. Wills set of "Engineering Wonders" (September 1927) but circulated by them anonymously as a General Overseas Issue.
We know that one of these places was the Channel Islands, in 1930, and that another was Malaya, in 1935. According to the World Index there is a variant printing of this issue, for it lists that the numerals can be (a) serif or (b) sans serif. I am not sure if this is the way the two issues can be split, but maybe you do? If so do tell us.