♫ – OFF TOPIC – Trzy wieki wykorzystania pary. (część 4. Przed konkursem „Rainhill Trials”…)

Fishbelly rail with half-lap joint, patented by Stephenson 1816

Fishbelly edge rails laid on stone blocks on the Cromford and High Peak Railway.
Cromford and High Peak Railway Specimen of Fishbelly Rail and stone blocks. 1831