Subway heat to help keep Warsaw warm: audio report 02.02.2024 22:30 Poland's capital has signed an agreement with Danish companies to study the possibility of reusing waste heat from Warsaw's underground railway to heat residential and public spaces. Audio 04'37 Audio report: Click to listen Photo:PAP/Rafał Guz The agreement was signed at Warsaw's Stadion Narodowy metro station on Thursday in the presence of Danish King Frederick X. Ada Janiszewska has the story. Click on the audio player above to listen.