code/modules/transport/transport_navigation.dm 
| /obj/effect/landmark/transport/nav_beacon/tram | transport_controller landmarks. used to map specific destinations on the map. |
|---|---|
| /obj/effect/landmark/transport/transport_id | transport_controller landmarks. used to map in specific_transport_id to trams and elevators. when the transport_controller encounters one on a tile it sets its specific_transport_id to that landmark. allows you to have multiple trams and multiple objects linking to their specific tram |