free:remove the protesters who have attached themselves to the rails anti-nuclear campaigners: a campaign is a set of activities planned to achicve something such as social or political change. These campaigners are people who oppose the use of nuclear power. concrete blocks: large rectangular pieces of concrete has been reversed back up the line: going backwards along the rails in the opposite direction It's thought it's now: people believe, although nobody actually knows sit-ins: a sit-in is a protest in which people sit in a public place and refuse to be moved | 
