Very nicely done. Your image is even more apt when you know that a steam engine can basically burn anything as fuel, not just wood or coal. A birthday cake? Throw it in the firebox. The material doesn’t matter as long as the engine is fed.
Though as someone from the US I have a soft spot for Primark ever since we were in Berlin for Christmas. With a load of German decor we were in need of a suitcase and they had a pretty nice full-sized one for €40. Still have it.