In which year was the Konkan Railway constructed?

The correct answer is 1998.

Explanation:

The Konkan Railway project was one of the most challenging infrastructure projects in post-independence India, connecting Roha in Maharashtra to Thokur near Mangaluru in Karnataka through a rugged terrain of hills, rivers, and gorges along the western coast.

• Construction officially began in 1990 under the leadership of the Konkan Railway Corporation Limited (KRCL), headed by Dr. E. Sreedharan.
• After nearly eight years of mega-engineering effort including building numerous long tunnels and major bridges, the entire 760 km route was fully completed and dedicated to the nation on January 26, 1998.

Therefore, the year of construction/completion of the Konkan Railway is 1998.