According to The Los Angeles Times, unspecified anti-government activities resulted in an unspecified number of stoppages of rail communications between Beijing and Guangzhou in China (The Los Angeles Times 20 May 1989, p. 5).
In the wake of the Tiananmen Square massacre, the following sources reported a number of activities which resulted in disruptions in rail communications in China.
The Washington Post refers to the "traffic-blocking demonstrations" which caused the blockade of rail lines in some Chinese cities including Guangzhou (6 June 1989, p. 2)
Another Washington Post report mentions that political activists in the southern and eastern provinces of China (which include cities like Guangzhou) resorted to a "strategy of controlled protest" (7 June 1989, p. 1). This strategy includes actions such as blocking roads and rail lines (Ibid.).
A Daily Telegraph article reports on the cancellations of trains between Nanking, Dhanghai and Peking (Beijing) and between Peking and Canton via Wuhan, presumably because of a student-made blockade on a bridge in Wuhan (7 June 1989, pp. 1, 2).
The British Broadcasting Corporation (BBC) reports on a blockade on the Canton-Shenzhen railway in Canton (Guangzhou) on 5 June 1989 (BBC Summary 7 June 1989, p. 1). Accordingly, several hundred students held sit-ins at the Wushan sector at 9:30AM while an unspecified number of students laid on the tracks to stop the No. 96 passenger train from Shenzhen to Canton and the No. 85 passenger train from Canton to Shenzhen (Ibid.). The source states that these actions caused a serious dislocation of rail traffic at the Wushan sector; after the students dispersed, traffic returned to normal at 13:45 (Ibid.).
Another BBC broadcast reports some unspecified disturbances in rail traffic in Canton on 6 June 1989 (BBC Summary 8 June 1989). The broadcast claims that there were no traffic blockades or strikes by workers and shopkeepers, but trains going north could only get as far as Shaoguan city (Ibid.).
According to an article in Libération, Canton's train connections with Beijing were still cut on 6 June 1989 despite the Chinese army's claim that the situation was normal in Canton (8 June 1989).
A Globe and Mail article reports the blockade of five main bridges of Guangzhou (Canton) by "residents" in reaction to the Tiananmen square massacre without mentioning whether the closure of the bridges affected the rail traffic (6 June 1989, p. 2).
The Manchester Guardian Weekly reports on blockaded roads and railway lines in Nanjing, Hangzhou, Hefei and other unspecified cities (11 June 1989, p. 2).
Further information on the subject is currently unavailable to the IRBDC.
Bibliography

BBC Summary of World Broadcasts. 7 June 1989. "Canton Bridges Blockaded by Students." pp. 1-2.

. 8 June 1989. "No Military Presence in Canton, Residents Complain About Traffic Jams." (NEXIS)
Libération [Paris]. 8 June 1989. "Nouveaux troubles en province."
The Globe and Mail. 6 June 1989. "China in Crisis: Furious Protesters Shut Down Streets." pp. 1, 2. (NEXIS)
The Daily Telegraph. 7 June 1989. "Students' Blockade of Rail Bridge Is Smashed." pp. 1, 2. (NEXIS)
The Los Angeles Times. 20 May 1989. "Chinese Crowds Block Troops; Army Sent to Enforce Martial Law in Beijing; Party Chief in Struggle for Power." pp. 1-5. (NEXIS)
The Manchester Guardian Weekly. 11 June 1989. "China Threatened by Prospect of Civil War." pp. 1, 2. (NEXIS)
The Washington Post. 6 June 1989. "Protests Losing Steam in Shanghai; Traffic Paralysed in Other Cities Workers Become the Activists as Students Drop Out." pp. 1-3. (NEXIS)
. 7 June 1989. "Shanghai Protesters Try to Avoid Clashes." pp. 1-3. (NEXIS)
Attachments
BBC Summary of World Broadcasts. 7 June 1989. "Canton Bridges Blockaded by Students." pp. 1-2.
. 8 June 1989. "No Military Presence in Canton, Residents Complain About Traffic Jams." (NEXIS)
Libération [Paris]. 8 June 1989. "Nouveaux troubles en province."
The Globe and Mail. 6 June 1989. "China in Crisis: Furious Protesters Shut Down Streets." pp. 1, 2. (NEXIS)
The Daily Telegraph. 7 June 1989. "Students' Blockade of Rail Bridge Is Smashed." pp. 1, 2. (NEXIS)
The Los Angeles Times. 20 May 1989. "Chinese Crowds Block Troops; Army Sent to Enforce Martial Law in Beijing; Party Chief in Struggle for Power." pp. 1-5. (NEXIS)
The Manchester Guardian Weekly. 11 June 1989. "China Threatened by Prospect of Civil War." pp. 1, 2. (NEXIS)
The Washington Post. 6 June 1989. "Protests Losing Steam in Shanghai; Traffic Paralysed in Other Cities Workers Become the Activists as Students Drop Out." pp. 1-3. (NEXIS)
. 7 June 1989. "Shanghai Protesters Try to Avoid Clashes." pp. 1-3. (NEXIS)