The second of five 24-hour train strikes takes place today in the pay row at Irish Rail.
DARTs and commuter services are down which is affecting passengers in the city this morning, with 150,000 discommoded by the nationwide industrial action.
Staff haven't had a pay rise since 2008 and are calling for a no-strings-attached 11.25% increase over the next three years.
Irish Rail says it can only offer 5.25% with increased productivity. Management says the average worker is earning €62,000 a year and it cannot meet the pay demand.
The company says that would add 43 million euro to the wage bill and could cause Irish Rail to go bust.
Unions warned last week the strike could escalate in the lead up to Christmas and could even stretch into the new year.