Which of the following railway zones has recently completed 100% electrification of its entire route?

Konkan Railway

The correct answer is Option (2) → Konkan Railway

Out of the options you listed, the railway zone that has recently completed 100% electrification of its entire route is:

• Konkan Railway (as of March 30, 2022)

Konkan Railway is not a very extensive network, and it achieved 100% electrification before some larger zones.

Here's a quick update on the electrification status of other options:

• South Central Railway: While not yet at 100%, South Central Railway is one of the zones actively working towards electrification of its routes.
• Harbour Railway: This is a suburban railway network serving Mumbai and is partially electrified.
• North Eastern Railway: North Eastern Railway is also one of the zones working on electrification projects, but it hasn't achieved 100% yet.