Better bridges parameters, tweaked for TTRS/ARRS:
1. first grid, suspension and cantilever bridges available in half of XIX century;
2. corrected spread and ratio of speeds and costs;
3. bridge base costs and ground levelling costs raised 8x, additionally tunnel building and water clearing costs increased 4x;
4. similar properties of suspension and cantilever bridges;
5. short bridges (concrete, grider) can be 4 tiles long (+ 2 bridge heads);
6. silicon bridge for very fast trains (vaccum tube etc).

Tracking table, sorted by year:

bridge type		year	lmin	lmax	(+2 bridge heads)		p.factor	v km/h
brick			0	0	10					46		70
grid low		1840	1	6					25		110
suspension iron	1860	5	16					34		100
cantilever iron	1870	3	12					40		120
suspension steel	1925	5	32					40		120
cantilever steel	1930	4	17					43		140
concrete		1935	0	4					50		160
grider steel	1965	0	4					86		180
modern tied arch	1970	3	5					45		160
suspension modern	1980	4	25					78		180
concrete viaduct	2000	2	18					100		256
tubular steel 	2020	2	64					150		800
tubular silicon	2040	2	32					256		4000

License:
betabridges v.0.5 for OpenTTD, created with Grfmaker, NFO adjusted manually and compiled with Grfcodec.
Copyright 2015 McZapkie

This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License, version 3, as published by
the Free Software Foundation; or, at your option, any later version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the 
Free Software Foundation, Inc., 1
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

For betabridges NFO source code or bug tracking: mczapkie at gmail.com 
