Perhaps because three of his estates were in the Shire River, in the 1890s Sharrer also built up and operated a fleet of steamers on the Zambezi and Shire rivers through a company named Sharrer's Zambezi Traffic Company Ltd.
Mungkin karena tiga dari usahanya terletak di sungai Shire, pada tahun 1890an Sharer membangun dan mengoperasikan searmada kapal uap di sungai Zambezi dan Shire melalui sebuah perusahaan bernama Sharrer's Zambezi Traffic Company Ltd.