Officials say a prolonged dispute would hurt the economy

The strike will affect passenger and freight trains for a limited period from Friday, GDL added.

National rail operator Deutsche Bahn had proposed a 10% salary increase, but GDL is holding out for a 30% rise.

Deutsche Bahn has been locked in a wage dispute for months with GDL, which says that train drivers are underpaid.

The rail operator has already agreed a smaller deal with two other unions which will see workers receive a 4.5% rise in wages.

GDL chairman Manfred Schell said that Deutsche Bahn "bears sole responsibility" for the strike.

Government officials have warned that a prolonged strike could damage the German economy.

Deutsche Bahn carries some 5 million passengers daily.