Children ride toy tractors at farmers' protest in London

Contractors clear debris from Baltimore bridge collapse

New cleaning vehicles rolled out for spring in Russia

Four children buried alive when they fall into pit being excavated in India

Tractors prepare for heavy snow in St Petersburg, Russia

Donkeys replace tractors to clean up beach in Saint-Tropez, France

Tractors clear snow from icy roads in St Petersburg, Russia

New tractors prepare for winter snow in St Petersburg, Russia.