FRAGMENTATION? Where Worlds Collide has picked up my post on Chicago's Metra working despite "fragmentation." That's a British term of art I don't fully understand. It might not be accurate for Metra in any event, as Metra's locomotives, crews, and coaches are their own, with running powers purchased over the freight railroads once out of terminal limits. And I believe the freight railroads purchase some running powers over Metra's lines.
The Superintendent welcomes constructive criticism, i.e. we will respond to "Could do with some more railway-related blog entries, though!" as circumstances permit. Please note that the failures of the academic enterprise are of more than academic interest around the Shops, however, and that there's no shortage of bad economics to point out.