World’s largest (57 km) and deepest railway tunnel are opened in : March 27, 2021 / By Preparation Point / EXCISE & TAXATION INSPECTOR DG Khan Region Control Share on WhatsApp Share on Facebook Share on Twitter Share on LinkedInA) China B) THE USA C) Switzerland ✓ D) Itlay Share this:TwitterFacebookMoreTelegramWhatsAppLike this:Like Loading... Related Share on WhatsApp Share on Facebook Share on Twitter Share on LinkedIn