Open TTD v.1.9.3

Edited for grammar and legibility. Additional assessment is needed for formatting and correctness.

Enable Infrastructure Maintenance

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(fig.1) In Settings

Options (ingame) --> Settings --> Accounting

When enabled, company maintenance costs grow exponentially with their network size. This means that larger companies are affected more than smaller ones.

In the late game, short connections between industries or cities may not earn money. They can even be a net negative despite finance reports showing income. With this setting ON, players must manage rising network maintenance costs, which are further compounded by inflation. For more information see Economy.

Infrastructure Window -Ingame-

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(fig.2) Infrastructure Window

Company finances information --> Infrastructure
or

Company information --> Details

Network Size Calculation

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(fig.3) Network size example

Network size is determined by the number of track and road pieces used and the complexity of those used tiles, not by the distance or tiles covered. This results in higher costs for dense networks that require more complex intersections than diffused networks with more space between junctions.(fig.3)

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(fig.4) Intersection example

Intersection Complexity Calculation
The number of rail pieces counted is not the same as the number of rails placed (fig.4). The number of rail pieces in a tile is modeled by: n², where n is the number of rails used. On one tile:

• One rail counts as 1 rail piece (1x1)
  
• Two rails counts as 4 rail pieces (2x2)
  
• Six rails counts as 36 rail pieces (6x6)
  

A straight rail divided by a street counts as 2 rail pieces.
Street intersections are counted by the number of sides the intersection touches.

Tunnels and Bridges
The calculation for tunnel and bridge pieces is identical. For roads, the tunnel piece count is multiplied by a factor of 8, and for rails it is a factor of 4. A street tunnel or bridge of length 10 will count as (10 x 8), or 80 street pieces. A railway tunnel or bridge of length 10 will count as (10 x 4), or 40 rail pieces.

Non-linear cost increase

The game multiplies the cost by the square root of the total rail piece count, as determined by the intersection complexity process described above. The complete formula is:

Cost = Nt * Ct * sqrt(Na)

where
Nt = rail piece count for given type
Ct = cost factor for given type
sqrt(Na) = square root of total rail piece count (all types)

When only a single rail type is in use, this can be simplified to Cost = C * N^(3/2)

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(fig.7) 10 Monorail rail costs

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(fig.8) 20 Monorail rail costs

Here is an example list for the cost increase, with a rough factor to show the cost increase from one row to the next. (Used Maglev rails)

Summary cost increase
As the number of rails doubles, we can expect a cost increase of 280%
(exp. 936€ for 40 pieces x 2.8 = costs for 80 pieces). (fig.7)(fig.8)

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