The steam engine Alex is the smaller variant of this steam engine series, with a slender vertical boiler suitable for small boats, for example the Alexandra and smaller models like Anna.

• 蒸汽机亚历克 阿莱克斯是这个蒸汽机系列中的小型锅炉版本，以细长垂直锅炉适合小型船只，例如亚历山德拉和较小的模型像安娜。