Wheel set with spoked wheels

The railway wheel set by Friedrich Krupp AG from 1909 symbolises the trademark of the Krupp company and the most important invention by Alfred Krupp, with which he revolutionised railway history and made a huge fortune: the seamless wheel tyre. It no longer had a fragile weld seam, as it was not welded together from a round piece of iron – as had been customary until then – but was created by drilling a hole in a piece of iron and pulling it apart in the fire to form a seamless wheel.