Complex sentence: US&S wigwags were also used by the CPR on its Canadian lines; the last ones in use on the CPR believed to have been removed in Chatham, Ontario in the mid- 1980s.
Split into simpler sentences: US&S wigwags were also used by the CPR on its Canadian lines. The last ones in use on the CPR are believed to have been removed in Chatham, Ontario in the mid- 1980s.