@waddoboro@seatsixtyone It will. The single-track connection to Sirkeci will not only host public transport service, but also allow trains like Sofia Express to depart from the heart of Istanbul.
@_Renke No attractive solution unfortunately. Isparta to Denizli by Goller Express, Denizli to Eskisehir by Pamukkale. By train this both will take a day. By bus it’s 4-5 hours. Then Eskisehir to Istanbul by HST.