i cannot comment on the Lionel volumes in particular, but i recently learned a good lesson about buying used books i think others might find useful. condition ratings on books available through used book resellers are extremely critical. not knowing exactly what to expect, i recently bought a Bing catalog reprint volume that was indicated as being in "Good" condition and priced well below a few others ranked as Very Good and Excellent. as it turned out the book was (to me) in near mint condition while the Good rating was probably chosen to cover a very few pages that had some penciled-in prices which are probably erasable (though to me it's just more information so i'll leave it as is) and a few notes written on some blank cover sheets near the end.
since most people in this hobby probably buy books more for reference than for their collector value, i would definitely consider some lower condition ratings for the exact same useful information at a cost savings.