Sharrer became a director of the Shire Highlands Railway Company Ltd and continued as such after he left the protectorate, and was also a director of the Central Africa Railway Company Ltd which was built after his departure.
Sharrer menjadi direktur Shirle Highlands Railway Company Ltd dan terus melanjutkannya meski ia meninggalkan protektorat, dan ia juga direktur Central Africa Railway Company Ltd yang dibangun setelah kepergiannya.