I agree completely. I am baffled by the support that this and other "rails to trails" initiatives get around the world. At a time when we are trying to decarbonize, we should be investing in modernizing and upgrading the existing railway infrastructure, not scrapping it for recreation. This is a vanity project. California has enough hiking trails. It has too many cars and not enough public transport.

A similar project is underway in Ireland [0], where they decommissioned a large number of former passenger lines in the 1970s, and are now spending millions of euros converting them to "greenways". To give one example, the Youghal to Midleton "greenway" replaced a former commuter rail line connecting commuter towns to Cork City. Every day, thousands of people drive between those towns, resulting in traffic jams and unnecessary CO2 emissions. Re-opening the train line would be a no brainer, they have more commuters today than ever before. Instead, residents now have the option of cycling or walking along a desolate trail through a bog.

[0] https://www.corkcoco.ie/en/resident/greenways/midleton-to-yo...