Placed after the last bridge(set) in the newgrf list this grf will modify the base price and top speed for all bridges. I choose to modify the top speed to get a better spread and then let the price be directly related to the top speed.

This means that the following bridges are available:

Wooden - Top: 40 mph
Concrete - Top: 60 mph
Girder, steel - Top: 80 mph
Suspension, concrete - Top: 180 mph
Suspension, steel - Top: 120 mph
Suspension, steel - Top: 80 mph
Cantilever, steel - Top: 100 mph
Cantilever, steel - Top: 130 mph
Cantilever, steel - Top: 150 mph
Girder, steel - Top: 160 mph
Tubular, steel - Top: 200 mph

Furthermore some building costs are affected too (compared to the base price):

Raise bridge building cost (x64)
Raise tunnel building cost (x64)
Raise terraforming cost (x32)

This grf modifies the base costs of building infrastructure. The idea is to make the game more challenging, and to encourage players to build in the landscape, rather than just flattening, bridging and tunneling the landscape into insignficance.

This NewGRF gives you the possibility to modify base costs, like building bridges, tunnels and airport; aircraft purchase, raise/lower land, clear water, aircraft running costs and funding industries. There will more (or all) come...
(Simular to pb_build.grf but conifgurable over parameters.)

The Dutch Tram Set attempts to give an historical overview of Dutch
trams while ensuring quality gameplay. It works well with OpenTTD's
realistic road vehicle acceleration and for that purpose includes as
much actual vehicle properties as possible.

Vehicle capacity is optimized for gameplay (higher than actual seated
capacity, but lower than seated+standee capacity) and based on actual
vehicle length to maintain historic differences between vehicles. By
default, the vehicles can carry passengers only, but a parameter option
allows refitting to all cargo types.

Vehicles are drawn to their historic liveries. Some vehicles even come
in multiple liveries. A parameter option allows to change all liveries
to company colours (2CC), aimed at multiplayer games.

Vehicle prices are balanced against the default TTD buses. Tram purchase
is more expensive than bus purchase, but tram running costs are lower
than bus running costs to compensate for the higher initial investment
costs. Vehicles in the Dutch Tram Set are furthermore balanced between
themselves. Purchase costs depend on vehicle weight (material cost),
power (engine cost) and length (furniture cost). Running costs depend
on capacity (cleaning cost), speed (maintenance cost) and power
(electricity consumption).

Alternative Base Costs
======================

This plugin alters OpenTTD base costs. The goal of this NewGRF is to make the
gameplay more realistic, challenging and fun. The plugin was originally
designed for map 'Lithuania.scn' but is also suitable for all other OpenTTD
maps.

Base costs modifications
------------------------

x1 misc
x2 build track
x0.5 build road
x1 place signal
x32 build bridge tile
x2 build rail depot
x2 build road depot
x2 build ship depot
x64 build tunnel unit
x16 build platform unit
x0.5 build platform fixed
x16 build airport tile
x1 build bus station
x1 build lorry area
x64 build dock
x0.5 locomotive purchase
x1 waggon purchase
x4 aircraft purchase
x0.5 road vehicle purchase
x2 ship purchase
x1 plant tree
x512 raise/lower land
x1 clear grass
x2 clear rough land
x4 clear rocks
x2 clear fields
x1 remove tree
x1 remove track
x1 remove signal
x1 remove bridge tile
x1 remove rail depot
x1 remove road depot
x1 remove ship depot
x1 remove tunnel tile
x16 clear water
x1 remove platform tile
x1 remove airport tile
x1 remove bus station
x1 remove lorry area
x1 remove dock
x8192 remove house
x1 remove road
x1 steam engine running costs
x1 diesel engine running costs
x1 electric engine running costs
x2 aircraft running costs
x0.5 road vehicle running costs
x1 ship running costs
x0.5 funding industries

Authors
-------

brisky, carnifex

Change the base costs of TTD configurable over parameters.
Usage: parameter pairs which the first value is the ID of the cost, the second the factor (default: 8).

http://wiki.ttdpatch.net/tiki-index.php?page=BaseCosts
Formula for factor: NewBaseCost = OldBaseCost * 2^(n-8)