(Updates number of injured,)
MEXICO CITY, Aug 25 (Reuters) - At least four people were killed when a cargo train nicknamed "La Bestia", or The Beast, on which would-be migrants hitch rides toward the U.S. border, derailed in a remote area of southern Mexico on Sunday, emergency services said.
Some local media said the death toll could be as high as 50, and said ambulances were unable to reach the scene of the accident in Huimanguillo in the southern state of Tabasco because of the difficult terrain.
Images from the scene showed freight cars upturned, wheels separated from their base.
Luis Felipe Puente, national emergency service coordinator, said on Twitter That four people had been confirmed dead and another 35 people were injured, 16 seriously, but the death toll could rise.
Migrants often jump aboard La Bestia under cover of darkness. At times, several hundred migrants have been found on the train, either in freight cars or sitting on rooves. (Reporting by Alexandra Alper and Tomas Sarmiento; Writing by Simon Gardner; Editing by David Brunnstrom)