Scientific paper ID 1109 : 2015/1

The paper considers two option solutions for modernization and reconstruction of railway lines Serbian border (Dragoman) - Sofia - Plovdiv - (Svilengrad) Turkish border and the second Danube Bridge (Vidin) - Sofia - Kulata. In the first option solution is adopted the government program and OPTTI. In his lines are electrified with parameters of 160/200 km / h., With the ERTMS Level 1 is reserved in - mostly current state - where a single line remains such, only modernized. In a second variant solution all lines are doubled and electrified parameters of 160/200 km / h., With the ERTMS level2