Circar was through GNT almost from the beginning itself. It was introduced right after the GNT-KCC-BZA, and BZA-GDV-BVRT gauge conversion, which was completed sometime in 1963-65. You can see this in this old SCR schedule from 1977 shared by Mani Vijay Sir on IRFCA :
click here

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I remember circar running from MSB-Kakinada some 15 years back
With light maron colour livery coaches
I dont know why the member is very specific abt TEL
Insted if that bypass is helpful to avoid reversal for OGL-BZA trains at GNT will be a advantage...but that is highly impossible as we now got New GNT.

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K now clear that starting via BZA-GNT - TEl , then diverted to BZA- TEl and again re routed through NGNT.

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Thanks fr the clarification.
I can understand ur concern is to provide GNT with much better traffic of south bound trains by providing the 10kms abandoned linkage which reduces the little round about in TEL - GNT line therfore skipping TEL. But TEL connectivity is also equally imp as it serves whole Krishna Delta. Moreover doubling of TEL-GNT and MPS increasing in BZA-GNT is already in progress , the prime motive being improving and increasing connectivity to GNT (the new capital area).

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