July-August Enterprise disruption

[ACustomer]

I see that there will be bus transfers on all Enterprise services for a 4-week period (July 27 to August 23) due to engineering works between Portadown and Lisburn. Apparently almost all NIR Portadown-Belfast services are also cancelled. Any information on what's happening? I would hope that something is being done to improve the track between Lurgan and Lisburn: it's pretty straight and should be suitable for 90mph, but has been appallingly neglected for years.