NYT1987年的报道中提到中国跟加拿大和美国签过还旧债的协议. 不仅如此，美国高院还驳回过1911年铁路债券人的请愿

https://www.nytimes.com/1987/06/08/business/china-britain-settle-claims.html

The New China News Agency said Britain was the first Western European country to reach such an agreement with China, which has signed similar accords with Canada and the United States.

China had been barred from the American capital markets because of pending legal action by holders of bonds issued before 1949. But the Supreme Court in March rejected a petition by holders of railway bonds issued in 1911 by the ruling Qing dynasty. Two weeks ago, China announced it would borrow money for the first time since 1949 in the American capital market.