Indian Railway
2 states of North East India will be connected through Broad Gauge. They are:

Mizoram and Manipur
Manipur and Meghalaya
Meghalaya and Assam
Mizoram and Arunachal Pradesh

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Indian Railway
TCAS full form is:

Train Collision Avoidance Software
Train Collision Advance System
Traffic Collision Avoidance System
Train Complement Accident Software

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