ORIGINAL: redrum68
For rule of thumb, you should generally place supply depots at the halfway point between 2 truck stations so they get as far from them as possible in both directions along that road to ensure as much AP has been used before it reaches them. And generally they are more useful the larger the distance between two truck stops is (or at least where ever you can ensure it hits the supply depot AP bonus before reaching it).
I am not sure this is true, see p2 in the manual:
§ The Range Boost is not cumulative with multiple Supply Bases en
route (if you already have a Supply Base in place and at the end of the
line you are not receiving enough Logistical Points, you should build
another Truck Station somewhere in between).
§ If Trucks passing it by are already beyond optimum range, they will
not be restored to optimum range, but their range will be extended at
their current %.
1) In case of supply between two cities, using a slightly adjusted example from the manual. If you have 2 City with a Private Transport Hub and a 22 hex Dirt Road in between. Then:
If you put the supply depot on hex 5 in either direction you'd get 100% flow.
If you put the supply depot in the middle on hex 11, you'd get 40% flow bottle neck in the middle.
2) In case of supplying the front line (which is what I am planning todo) there is no second truck station, them it is certainly best to put the supply depot just at the optimal range.
* The only complication to this is if you are planning to upgrade your truck depot or road later on.
ORIGINAL: DTurtle
The manual says: dirt roads 10 AP, sealed roads 5 AP, railroads 2 AP. The cost on sealed roads was increased to 7 AP and on railroads to 5 AP.
Good to know both the numbers and where to check this.