>>1463432Because Co-Co locs can't turn (unless you go for articulated frames, like the Class 66 for instance, at which point the simplicity and relative cheapness is lost).
Bo-Bo-Bo's are rare because there's hardly any use for them, they're a last resort design when :
>You need more tractive effort than a Bo-Bo>You don't need enough tractive effort to justify coupling two Bo-Bo locs>You can't run a Co-Co due to excessive track curvatureWhich explains why you'd find them in Italy or Japan, as those are both mountainous lands with demanding tracks.
Another absolutely based Bo-Bo-Bo design is the Eurotunnel Class 9. 7MW / 400kN beasts that can still manage 100m turn radii on the chunnel loops.
