This seems to be some draft spec for TTDPatch support. The implementation status is unknown.
|40||B||Age of the bridge in years (or, strictly speaking, the difference between the current year and the year the building was built). Returns 255 for buildings older than 255 years.|
|41||B||Terrain type: 0 normal, 1 desert, 2 rainforest, 4 on or above snowline|
|80+x||None defined yet, Trying to access these variables crashes TTD.|
Age of the bridge in years (40)
The age of the bridge.
Terrain type (41)
Terrain type: 0 normal, 1 desert, 2 rainforest, 4 on or above snowline