A few wigwags continue in operation . There are a number of US&S wigwags that have been preserved and restored by museums. Most of these wigwags were removed in the 1970-1980s as crossings were updated. US&S and WRRS wigwags were also used by the CPR on its Canadian lines. In 2011, the CASO sub was abandoned & the wigwags will be removed. Wigwags were also manufactured by Union Switch and Signal (US&S).