Yeah, several legal interests and financial stakeholders are potentially involved. I imagine the National Park Service has some sort of easement or agreement to host pedestrians on that bridge (because CSX would have no motivation to do so). Nearly all of the bridge is on the Maryland side of the state line, as Maryland "owns" the Potomac River, with the WV and VA state lines lying along the south bank. Of course, the town of Harpers Ferry wants that pedestrian bridge, as it supports a lot of foot traffic to and from retailers and shops in town. Since the pedestrian bridge is so critical to local tourism, I wouldn't be surprised if the town of Harpers Ferry would be interested in financially supporting the repairs, at least in part. However, as the bridge is almost entirely within the state of Maryland, I'm not sure how that would work. I imagine the NPS has the ultimate authority over the bridge and its sustainment and repair, even though multiple states and towns are involved.