Giugiaro
Member
I'd like to ask if it's possible to resize a single track tunnel onto a double track, and if this solution is more or less costly than building a second single tunnel parallel to the existing one.
I understand that resizing an already existing tunnel is both dangerous and disrupts railway traffic during the intervention.
Are there any examples of such a procedure being taken or done in the past?
I understand that resizing an already existing tunnel is both dangerous and disrupts railway traffic during the intervention.
Are there any examples of such a procedure being taken or done in the past?