Final answer:
After the construction of a building in the air rights above a railroad right-of-way, trains can still operate as usual, as long as they obtain the building owner's permission and do not cause any problems for the building's occupants.
Step-by-step explanation:
After the construction of a building in the air rights above a railroad right-of-way, trains can still operate as usual, using the tracks under the building as long as they first obtain the building owner's permission. However, they must ensure that their operations do not cause any problems for the building's occupants.