The Antiplanner observes, in the context of the Washington metro crash, that governments are happy to appropriate funds for expensive new facilities, but almost never want to appropriate funds for capital replacement and refurbishment of such facilities 20-30 years later. Such refurbishment is nearly always necessary. Private businesses plan for it -- for example, oil companies plan and budget on the assumption that all of their gas stations will need to be torn down and rebuilt every 20-25 years.
I work with public recreation a lot and can say that the exact same problem exists -- politicians love funding a new park or visitor center or museum expansion, particularly if they can get their name on it, but consistently refuse to fund capital replacements decades later when these are needed. I guess they are unsexy.