Bogada is the name of the region to the north of this tunnel :) There used to be a Bogada station on this route when it was on metre gauge. It used to run on a slightly different alignment in this section. There used to be another Bogaada tunnel on the metre gauge route.
Only one of them was the Bogada tunnel I guess. Originally there used to be one tunnel called the Nandiconama tunnel which was the longest one on the route, and a shorter one nearby ( that was unnamed). The route was slightly realigned later and the new longer tunnel was opened near Bogada. You managed to get any pics of the old Dorabavi viaduct?