Why are the toilets on the train connected directly to the tracks?

Were slow

Had short routes

Made frequent stops

Didn’t prioritize onboard sanitation

Eventually, as journeys became longer, toilets became a necessity.

But engineers faced a challenge:
How do you add toilets to a moving vehicle with no plumbing connections?

The simplest solution won.

Why Gravity Was the Easiest Answer
Early railway designers worked with limited technology.

There were:

No compact waste tanks

No odor-control systems

No vacuum toilets

No environmental regulations

Gravity-based toilets required:

No pumps

No moving parts

Very little maintenance

Minimal added weight