In particular , the section in the upper Pegnitz valley has many engineering structures that would be difficult and expensive to electrify .
It is unclear when the remaining 170 km of line between Nuremberg and Hof will be electrified .
The section in the upper Pegnitz valley has many engineering structures that would be difficult and expensive to electrify .
It is unclear when the remaining 170 km of line between Nuremberg and Hof will be electrified .