Question

Q.1 Define survey
i. Main line​

Answer 1

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A SURVEY LINE is a line produced on a cast by a surveyor or scribe marking the greatest prominence of contour in relation to the planned path of placement of a restoration.

I hope its help for you!

Answer 2

Hey mate!!!✨✨

Here's your answer...❤❤

Main line is a track that is used for through trains or is the principal artery of the system from which branch lines , yards , sidings and spurs are connected.

Hope it helps you...

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