Following the reorganization of the Chinese Eastern Railway in 1929 and after the conclusion of the Sino-Russian complications, Mo was appointed president of the Board of Directors ("duban") of the railway. He was later appointed as the official representative of the Mukden (Shenyang) and Nanking Government for the purpose of negotiating a settlement of outstanding problems pertaining to the administration of the C.E.R. He was appointed plenipotentiary delegate to the Sino-Russian Conference at Moscow in May 1930. Mo visited USSR for up to 25 talks, but returned to China in December 1930 due to a deadlock of the conference. After Japan's Invasion of Manchuria on September 18, 1931, the USSR sold its interests in C.E.R. to Japan's puppet state Manchukuo.