In reply to jim jones:
From what I've read, 'When the tigers broke free' was certainly intended for the album, being as it is lyrically integral to the concept and, of course, part of the film soundtrack. But it was excised toward the end, as was other material from The Wall (most notably, 'What shall we do now' criminally butchered into its hastily abbreviated 'What now') because of limitations of space.
Apparently Roger Waters was all for releasing The Wall as a triple album, but this was one step too far both for the record company, and for the other members of the band, who knew that, for tax purposes, the album had to be a success.
One listens to many double albums then and now, and often immediately thinks of the great single album that could have been created if the filler and the fluff had been cut out. I've been a Wall enthusiast (and obsessive!) most of my life, and I know that if I could somehow alter time and conjure up Waters' intended magnum opus from the original sessions, then we'd have the contradiction of perfection being bettered!