Blue & Pink tracks denote tracks under construction and being Upgraded.
1. Pink single -> Gauge conversion MG/NG to BG single line.
2. Pink double -> Doubling of Diesel BG line.
3. Blue single ->Electrification of Single Diesel BG line.
4....
more... Blue double -> Electrification of Double Diesel BG line OR Doubling of Electrified BG line.
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You may also click on the corresponding blue & pink tracks for further details.