GY-KCG is not being doubled right now..The idea is basically to double and electrify RU-DD, Doubling is already complete except in patches and electrification is complete till Kamalapuram i guess..We can expect trains running with WAP-4 right from MAS to GTL hopefully by this year end.
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GY-SBC is also being electrified with an idea of electric connectivity to SBC once GTL-PUNE is electrified too. Both the projects are by RVNL.
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Land Acquisition has been completed and construction commenced for Electric Trip SHed/Electric Loco Shed at GTL to facilitate GTL-SBC and GTL-RU routes..