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Gauge Conversion works on Lumding-Silchar section: Tunnel No.7 was made through
Gauge Conversion works on Lumding-Silchar section: Tunnel No.7 was made through
Silchar (SCL): As a major step taken towards completion of the Lumding-Silchar gauge conversion project, tunnel No. 7 (1,687 metre length) near Mahur was made through on August 8 with underground excavation work from both ends meeting at a point.
This tunnel, located between Phiding and Mahur stations, is the second-longest tunnel being constructed under the gauge conversion project of the Northeast Frontier Railway (NFR), said DC Borah, NFR (Construction) senior PRO.
“As the area is geologically characterised by the Naga thrust on the west and Disang thrust on the east, the alignment of tunnel No. 7 obviously passes through numerous faults and thrusts. Moreover, the rock mass encountered comprises mainly of soft shale in highly weathered condition,” said Borah. He added, “In view of this, most adverse geological conditions were encountered during underground excavation for this tunnel and its completion is seen as a major challenge for the construction engineers of NFR.”
