The return load from Rigby Road depot was Brush car 622 which was acquired by the LTT for spares or possible future use - it is not yet considered to be 'preserved'. It has received the trucks (partly worn) that were under car 632 (restored to 1970s green & cream with advert boxes sponsored by Trams Magazine and the Tram Shop), it's motors have been removed for use in OMO car 8 and it's compressor used for car 143!
622's claim to fame is the attractive Blackpool Zoo Park advert livery it carried between 1975 and 1982 - although the tram didn't operate from November 1980 until Easter 1983 after it received accident damage.