Mexico clamps down on migrant freight train travel
26 August 2014 Last updated at 11:07 BST
A journey aboard Mexico's most notorious freight train, known as La Bestia or 'the Beast', is fraught with danger.
Hundreds of migrants are injured or killed every year attempting to ride its roof. Many more are robbed or attacked by gangs.
Now, the Mexican government has unveiled new measures to try and prevent people from using the trains to reach the US.
However, human rights groups say the move is part of a wider policy of clamping down on migrants, rather than offering them safer means of finding work.
Will Grant reports from Mexico.