I don't think that Amaravati railway line came exists. Even if it is exists it is just like a Gandhinagar Railway line, the trains which are running through New Guntur diverted via Amaravati, no originating trains. trains like Andaman Express diverted via Amaravati & they said that they given a connection to National Capital by this train. yes it is good if Amaravati get a railway line but the railway line is a like a Bypass for BZA to North-South Trains with a halt at Capital station.
About Amaravati Capital:
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We don't know the capital of AP, whether is Vizag, Amaravati or Kurnool. AP needs only one capital city either it is Vizag, Amaravati or Kurnool but only one. AP needs more developing cities like Cochin, Thiruvananthapuram, Malappuram, Kozhikode(Calicut) in Kerala & Coimbatore, Salem, Madurai & Tiruchy in Tamilnadu, Mangalore, Mysuru, Hubballi in Karnataka. These States have developed not only capital city, other cities within State.
TS & AP needs more developing cities. We have only Hyderabad & Vizag are developed Cities, after Hyderabad, Warangal is growing as a developing city in Telangana. Karimnagar, Nizamabad in Telangana, Srikakulam, Kakinada-Rajahmundry-Amalapuram-Bhimavaram belt, Ongole-Nellore-Tirupati, Kadapa, Nandyal-Kurnool, Tenali-Guntur-Mangalagiri-Tadepalli-Vijayawada-Gannavaram-Eluru needs development. But these things never happen