The Transport Minister has condemned protesters who paint bombed MP electorate offices throughout the country.

The Restore Passenger Rail lobby group has sprayed red paint on MP offices in Auckland, Wellington Christchurch and Dunedin -- despite meeting with Michael Wood last week.

Wood says today's demonstration is concerning for those who work in their MP offices.

Simon Barnett and Tyler Adams spoke with Save Passenger Rail's James Cockle to try and understand their motives.

LISTEN ABOVE

See omnystudio.com/listener for privacy information.