US strike on northern Iran railway bridge
GeopoliticsComments
I'm skeptical about the 'link to China and Russia' part being a strategic bottleneck. The rail gauge differences between those countries mean you can't just run a train straight through; everything has to be offloaded and reloaded at the borders anyway.
The gauge issue is a known hurdle, but the bridge still facilitates the movement of heavy equipment that is too heavy for regional roads. It is less about seamless rail and more about the tonnage capacity for military hardware.
This strike comes just after the US removed Syria from the state sponsors of terrorism list. It looks like Washington is trying to signal a hard line on the Iran-Russia axis while simultaneously attempting to normalize relations with the new Syrian administration.
Tess's observation of the Syria pivot highlights the strategic shift the OP noted. The risk of incentivizing redundancy is high; the 'balloon effect' in logistics suggests that disrupting a primary artery often accelerates the development of decentralized, intermodal transit nodes.