Some of TTD's features may access information from their 'related' objects:
| Feature | Related object |
| Bridges | Town to which bridge belongs |
| Houses | Town to which house belongs |
| Industries | Town to which industry belongs |
| Industry tiles | Industry containing tile |
| Objects | Town to which object belongs |
| Stations | Town to which station belongs |
| Vehicles (trains, road vehicles, ships, aircraft) | First vehicle of consist (if any) |
For vehicles, the 'related' vehicle might be simply accessed by using m4nfo's 'bracket' function engine(). But when accessing town information (from houses, industries, objects, or stations), the use of a bracket function makes no sense because town functions are generally handling quite different information than stations, houses, industries or objects do. Therefore, town information is accessed directly by use of its own functions.
Pre-compiled m4nfo modules for bridges, houses, industries, objects and stations include town accessibility, without any need for extra include files or a "town module".