Taking a rail journey invariably means going through a tunnel at some point. Most of the time it's over in a flash, the darkness racing by as quickly as the passing countryside. But have you ever wondered what it takes to build a railway tunnel? Today, modern technology makes it a far easier and safer undertaking. But how did they manage back in the day, when engineering even the shortest tunnel involved a high degree of risk and often cost lives?
Click through, get on track, and enter the world of the railway tunnel.