Migrants run to hide from the U.S. Border Patrol and the Texas National Guard after crossing into the United States from Mexico, in El Paso, Texas, U.S., May 08, 2023. Thousands of migrants in Mexico have been clambering onto dangerous freight trains rumbling northward in a scramble to reach the U.S. border by the time the United States ends a tough migration policy later this week. In recent weeks, up to several hundred people have boarded daily, activists and officials say. The rush has intensified as news circulates about the end on Thursday night of Title 42 - a COVID-era policy that since 2020 has allowed the U.S. to rapidly expel migrants back to Mexico.      REUTERS/Jose Luis Gonzalez SEARCH "GONZALEZ GRAF MEXICO TRAIN" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Athletics - Diamond League - Suheim bin Hamad Stadium, Doha, Qatar - May 5, 2023 Kenya's Faith Kipyegon crosses the finish line to win the women's 1500m REUTERS/Ibraheem Al Omari 

Athletics - Diamond League - Suheim bin Hamad Stadium, Doha, Qatar - May 5, 2023 Bahrain's Winfred Yavi in action before crossing the finish line to win the women's 3000m steeplechase REUTERS/Ibraheem Al Omari 

Athletics - Diamond League - Suheim bin Hamad Stadium, Doha, Qatar - May 5, 2023 Dominican Republic's Marileidy Paulino crosses the finish line to win the women's 400m ahead of second placed Shamier Little of the U.S. REUTERS/Ibraheem Al Omari 

Men, trying to cross the U.S.-Mexico border without being caught, run from United States Border Patrol agents, in advance of the planned May 11 ending of COVID-19 border restrictions known as Title 42, that have been in place since 2020, in Sunland Park, New Mexico, U.S. April 26, 2023. REUTERS/Paul Ratje 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan on her way to crossing the finish line to win the elite women's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan on her way to crossing the finish line to win the elite women's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan reacts as she crosses the finish line to win the elite women's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan reacts as she crosses the finish line to win the elite women's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan reacts as she crosses the finish line to win the elite women's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Britain's Mo Farah crosses the line to finish the elite men's race in ninth place REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Kenya's Geoffrey Kamworor celebrates as he crosses the finish line to finish the elite men's race in second place REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Kenya's Kelvin Kiptum celebrates as he crosses the finish line to win the elite men's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Kenya's Kelvin Kiptum celebrates before crossing the finish line to win the elite men's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Kenya's Kelvin Kiptum reacts as he crosses the finish line to win the elite men's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Kenya's Kelvin Kiptum crosses the finish line to win the elite men's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Kenya's Kelvin Kiptum celebrates as he crosses the finish line to win the elite men's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Kenya's Kelvin Kiptum in action before crossing the finish line to win the elite men's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Kenya's Kelvin Kiptum crosses the finish line to win the elite men's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Kenya's Kelvin Kiptum reacts before crossing the finish line to win the elite men's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Ethiopia's Alemu Megertu reacts after crossing the line to finish the elite women's race in second place ahead of third placed Kenya's Peres Jepchirchir REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan celebrates before crossing the finish line to win the elite women's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan reacts as she crosses the finish line to win the elite women's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan reacts as she crosses the finish line to win the elite women's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan reacts as she crosses the finish line to win the elite women's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan reacts as she crosses the finish line to win the elite women's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan reacts as she crosses the finish line to win the elite women's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan celebrates as she crosses the finish line to win the elite women's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan reacts as she crosses the finish line to win the elite women's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan reacts as she crosses the finish line to win the elite women's race REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Netherlands' Sifan Hassan celebrates as she crosses the finish line to win the elite women's race REUTERS/Andrew Boyers TPX IMAGES OF THE DAY 

Athletics - London Marathon - London, Britain - April 23, 2023 Australia's Madison de Rozario crosses the line to win the women's wheelchair race ahead of Switzerland's Manuela Schar REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Britain's David Weir crosses the line to finish the elite men's wheelchair race in fifth place REUTERS/Andrew Boyers 

Athletics - London Marathon - London, Britain - April 23, 2023 Japan's Tomoki Suzuki crosses the line to finish the elite men's wheelchair race in third place REUTERS/Andrew Boyers 

Athletics - 40th Vienna City Marathon - Vienna, Austria - April 23, 2023 Austria's Julia Mayer crosses the line to finish the Vienna City Marathon and break the Austrian women's record with Austria president Alexander Van der Bellen and sports minister Werner Kogler REUTERS/Lisa Leutner 

Athletics - 40th Vienna City Marathon - Vienna, Austria - April 23, 2023 Austria's Andreas Vojta crosses the line to finish the Vienna City Marathon with Austria president Alexander Van der Bellen and sports minister Werner Kogler REUTERS/Lisa Leutner 

Athletics - London Marathon - London, Britain - April 23, 2023 Switzerland's Marcel Hug celebrates before crossing the finish line to win the elite men's wheelchair race REUTERS/Andrew Boyers 

Athletics - 40th Vienna City Marathon - Vienna, Austria - April 23, 2023 Kenya's Samwel Mailu celebrates as he crosses the line to win the Vienna City Marathon and break the course record with Austria president Alexander Van der Bellen and sports minister Werner Kogler REUTERS/Lisa Leutner 

Athletics - 40th Vienna City Marathon - Vienna, Austria - April 23, 2023 Kenya's Samwel Mailu celebrates as he crosses the line to win the Vienna City Marathon and break the course record with Austria president Alexander Van der Bellen and sports minister Werner Kogler REUTERS/Lisa Leutner 

Athletics - 40th Vienna City Marathon - Vienna, Austria - April 23, 2023 Kenya's Samwel Mailu celebrates as he crosses the line to win the Vienna City Marathon and break the course record with Austria president Alexander Van der Bellen and sports minister Werner Kogler REUTERS/Lisa Leutner 

Participants view central Seoul after crossing a finish line during Sky Run, a vertical marathon event, held in the 123-story Lotte World Tower, in Seoul, South Korea, April 22, 2023. REUTERS/Kim Soo-hyeon 

Participants pose for photographs with their medals after crossing a finish line during Sky Run, a vertical marathon event, held in the 123-story Lotte World Tower, in Seoul, South Korea, April 22, 2023. REUTERS/Kim Soo-hyeon 

Participants pose for photographs next to the other people crossing a finish line during Sky Run, a vertical marathon event, held in the 123-story Lotte World Tower, in Seoul, South Korea, April 22, 2023. REUTERS/Kim Soo-hyeon 

A participant poses for photograph with his medal after crossing a finish line during Sky Run, a vertical marathon event, held in the 123-story Lotte World Tower, in Seoul, South Korea, April 22, 2023. REUTERS/Kim Soo-hyeon 

Participants pose for photographs with their medals after crossing a finish line during Sky Run, a vertical marathon event, held in the 123-story Lotte World Tower, in Seoul, South Korea, April 22, 2023. REUTERS/Kim Soo-hyeon 

A participant rests after crossing a finish line during Sky Run, a vertical marathon event, held in the 123-story Lotte World Tower, in Seoul, South Korea, April 22, 2023. REUTERS/Kim Soo-hyeon 

Paulina Borbolla Hernandez reacts after crossing the finish line of the 127th Boston Marathon, in Boston, Massachusetts, U.S. April 17, 2023. REUTERS/Sophie Park 

Vitaliano Flores Ortega reacts after crossing the finish line of the 127th Boston Marathon, in Boston, Massachusetts, U.S. April 17, 2023. REUTERS/Sophie Park 

Kenneth Deloff crosses the finish line with a Ukrainian flag in his mouth In the 127th Boston Marathon in Boston, Massachusetts, U.S., April 17, 2023. REUTERS/Brian Snyder 

Athletics - The 127th Boston Marathon - Boston, Massachusetts, U.S. - April 17, 2023 Former Boston Bruins player Zdeno Chara and Becca Pizzi hold hands as they cross the finish line of the 127th Boston Marathon REUTERS/Brian Snyder 

Athletics - The 127th Boston Marathon - Boston, Massachusetts, U.S. - April 17, 2023 Former Boston Bruins player Zdeno Chara and Becca Pizzi hold hands as they cross the finish line of the 127th Boston Marathon REUTERS/Brian Snyder 

Athletics - The 127th Boston Marathon - Boston, Massachusetts, U.S. - April 17, 2023 Former Boston Bruins player Zdeno Chara reacts after crossing the finish line of the 127th Boston Marathon REUTERS/Brian Snyder 

Athletics - The 127th Boston Marathon - Boston, Massachusetts, U.S. - April 17, 2023 Michele Exner and fellow participants react as they cross the finish line of the 127th Boston Marathon REUTERS/Brian Snyder 

Athletics - The 127th Boston Marathon - Boston, Massachusetts, U.S. - April 17, 2023 Participants react as they cross the finish line of the 127th Boston Marathon REUTERS/Brian Snyder 

Athletics - The 127th Boston Marathon - Boston, Massachusetts, U.S. - April 17, 2023 Kenya's Hellen Obiri crosses the finish line to win the elite women's race REUTERS/Brian Snyder TPX IMAGES OF THE DAY 

Athletics - The 127th Boston Marathon - Boston, Massachusetts, U.S. - April 17, 2023 Jade Costen and Emmie Costen hold hands as they cross the finish line of the 127th Boston Marathon REUTERS/Sophie Park 

Athletics - The 127th Boston Marathon - Boston, Massachusetts, U.S. - April 17, 2023 A participant is seen in the reflection of a puddle as they cross finish line of the 127th Boston Marathon REUTERS/Brian Snyder 

Athletics - The 127th Boston Marathon - Boston, Massachusetts, U.S. - April 17, 2023 A general view as participants cross the finish line of the 127th Boston Marathon 

Athletics - The 127th Boston Marathon - Boston, Massachusetts, U.S. - April 17, 2023 A general view as participants cross the finish line of the 127th Boston Marathon REUTERS/Brian Snyder 

Athletics - The 127th Boston Marathon - Boston, Massachusetts, U.S. - April 17, 2023 Kenya's Hellen Obiri crosses the finish line to win the elite women's race REUTERS/Brian Snyder