What the L? Gov. Cuomo rocked the regional transportation world this week when he cheered a report suggesting that the existing cross-Hudson tunnels between New Jersey and New York don’t need a full shutdown to rebuild them, potentially throwing yet another wrench into the plan to build a new pair of tunnels to boost interstate rail capacity, a $13-billion piece of the Gateway Project. It’s the latest baffling twist in the decade-plus-long saga. On Sunday, the governor suggested that a report done for the Port Authority by consultants London Bridge Associates showed that the existing century-old tunnels could be fixed...