One engine in the group, 226, is the last surviving unmodified phase 1 F40PH (the difference among phases lie in the fuel tank arrangement). F40PHs in original configuration are starting to become quite scarce as they are fuel hogs; hence they have not proven as popular in tourist and commuter service. Maine and Eastern, for instance, has opted to use FL9s for the tourist train and the Grand Canyon railroad still uses it's FPA4's (despite the fact that it has F40PHs). Many things including age, EPA regulations, and the permanent fuel crisis make F40s an endangered species (at least in their as built form). In that respect, many other 645 powered locomotives may also be endangered to with their ranks thinning rather quickly.
Also, most second hand F40PHs are leased through Rail World, so when they are returned to the lessor they may be in peril. There are many reasons why any museum could justify an F40PH (they were the standard national passenger locomotive for 25 years), though the parts demand will make acquisition of them rather difficult.
-Andrew Cornillie