 Five more, numbers 1621 to 1623, 1631 and 1632, were also converted to simple expansion locomotives in 1925.Three of these, numbers 1620, 1631 and 1632, were then transferred to East London where more powerful locomotives were needed since the mainline had a heavy gradient of one in forty (2½%) which started right at the end of the East London departing platform, making it an extremely difficult section.They appear to have not been up to the task in the Eastern Cape, however, since by 1926 they were observed there staged out of service.