When transit vehicles are retired from service due to age, condition, or changing agency requirements, they either go on the second-hand market or straight to the scrapyard. Ultimately not all transit vehicles that reach the end of their serviceable lives with one agency are repurposed with another agency or preserved, though a certain historically significant number do find their way into museums, historic fleets, and private hands. For the remainder however, the best case scenario is the salvaging and preservation of special or significant components of interest.