How do you think that the tram system will work? Will the player select a location from a map or something? That would be really cool. It would also be cool if the player had the option to sit through the tram ride and look at the bustling facility during their ride, like the ride in Black Mesa Inbound, but it can extend to other parts of the facility, and have shorter or longer length.
I think that when all of the maps are finished, there should be changelevels added in the tram system so that you can choose where to go. E.g. at a junction the player either goes left or right depending on the location selected at the beginning, and the tram goes past certain points (like if at the end the tram went straight past Sector C instead of stopping)