I have made a conversion of Metro Carriage Interiors by WastelandLoner. It adds interiors to all the metro cars throughout DC. While it does not cover busses like Busworld, it is of significantly higher quality. You enter metro cars through actual doors, and each interior is set to match the exterior both with placed objects and its spacial orientation (e.g. if a car is leaning sideways with rubble, the interior is at the same angle)
The original mod is located here: http://www.nexusmods.com/fallout3/mods/19988/?
My conversion is located here: http://www.nexusmods.com/newvegas/mods/58110/?
I converted it using the script, then manually forwarded changes from the fixes patch. All worldspace names are brought in line with TTW. I also manually changed .32 and shotgun ammo to their new types depending on what shotgun was nearest. I changed all placed skill books to NV Magazines equivalent for balance. This can be used with a certain version of Busworld edited for compatibility with TTWInteriors and this mod. Let me know if you find anything that I missed.
EDIT: Removed file. Download from Nexus to save bandwidth for this site.