I was looking at pictures of Providence and Worcester 1801 (U18B) at George Elwood's marvelous "Fallen Flags" rail photo site
http://www.rr-fallenflags.org
the other night and noticed something. There are four photos of the 1801 there. Two older ones, showing the unit in the red-and-white paint scheme, show it with FB-2 trucks: I assume it was delivered with these? Two later ones, after the unit had been repainted into the dark-on-top scheme show it with the drop equalizer trucks that railfans incorrectly (but there is no other agreed desuignation) call "AAR type-B." So obviously at some stage P&W switched trucks. My guess is that they decided the FB-2 (which supposedly give better adhesion) would be better employed under one of their bigger (U23B or B23-7) GE units. ?
http://www.rr-fallenflags.org
the other night and noticed something. There are four photos of the 1801 there. Two older ones, showing the unit in the red-and-white paint scheme, show it with FB-2 trucks: I assume it was delivered with these? Two later ones, after the unit had been repainted into the dark-on-top scheme show it with the drop equalizer trucks that railfans incorrectly (but there is no other agreed desuignation) call "AAR type-B." So obviously at some stage P&W switched trucks. My guess is that they decided the FB-2 (which supposedly give better adhesion) would be better employed under one of their bigger (U23B or B23-7) GE units. ?