Mitchel to Washington still intact and in service and would be part of J780's territory. Just very little demand for service, so J780 very rarely ventures out that way.
Monon is ABANDONED. It can not be used for storage. Abandonment has NOT been consumated yet because the City of New Albany is acting at the interim trail authority and has a notice of Interim Trail Use pending in front of the STB. A lot of the Monon right of way is an easement - when line ceases to be used as a transportation corridor, ground would revert to the adjoining land owners. The National Trails Act allows for a rail corridor to be conveyed to an authorized trail authority at which time the right of way becomes a trail, which by law, is still an approved transportation corridor. Removal of the track BEFORE the Interim Trail Use proceedings and tile transfer are complete could at worst case result in right of way reverting to adjoining property owners, and at the very least, bolster any legal actions brought against the right of way by NARPO (National Associated of Revisionary Property Owners).
As for the diamond, since it still physically exists, by law, whatever signaling equipment it is equipped with must be maintained and in service. Even though the Monon will ultimately be removed, retirement of the interlockings signals prior to removal would require a separate filing and hearing - not worth the effort - easier to simply maintain until it can be removed.