Start with a small question.

Why should something as ordinary as a fallen leaf matter to a railway? The interesting part is following the connection from a familiar object to a less familiar mechanism.

This is a proposed episode. The finished explanation will be built from checked sources, with the animation helping to show the mechanism clearly.

Questions to follow

• What happens where the wheel meets the rail?
• Which conditions change that contact?
• How do researchers investigate the problem?
• What can railway operators do about it?

Following the evidence.

The completed episode will link its important claims to the research and other dependable sources behind them. Source notes will explain what each reference contributes, rather than simply list links.

One connection leads to another.

The collection also includes possible stories about bookworm holes, fish ages, braided cables, switches and how we hear the past. Titles, research and production order are still being developed.