And diesel hydraulic trains (and some buses) usually use these: https://en.wikip... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

rsynnott 29 days ago | parent | context | favorite | on: Children's stunted lungs show recovery in ultra lo...

And diesel hydraulic trains (and some buses) usually use these: https://en.wikipedia.org/wiki/Retarder_(mechanical_engineeri...

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact