Railways are good for the environment but they are under threat because, in the long run, self-driving cars will be more convenient than trains.

In order to survive, railways must respond by offering customers a cheaper, faster and more frequent service.

This article explains how three linked innovations will allow the railways to prosper and expand, without the high cost of building new railway lines.

Driverless farm tractors are fast becoming a reality.

But Britain is lagging behind in their development.

We propose three innovations to give Britain a stake in the market.