param0: tunnels sprites to use
0 = Use default tunnels (compatible with all base sets, default)
strongly recommended for multiplayer games
1 = Use OpenGFX - compatible tunnel sprites
2 = Use TTD - compatible tunnel sprites.
3 = Disable the use of rail types (only sprite replacements, only for debugging)
Tunnel portal sprites are a bit difficult: they need to match the ground tiles -
which depend upon the base set being used by the player. In multiplayer games
different players use different base sets. Thus by choosing any tunnel portal
by default, this set would glitch for at least one third or two thirds of the
players (depending upon which option one choses). If you play in single player
only, you know your base set, then feel free to chose the new tunnel portals;
they are after all nicer than either original
param1: introduction year for modern depots (no effect for TTDP or param0=3)
0 = 1975 / never (default, see text)
else: introduction year
For OpenTTD > r20003 the introduction year sets the date when new
depots will be built in the modern style. Earlier versions of
OpenTTD, including the 1.0.x series don't support this; thus the parameter
sets the date when ALL depots change their style from old to modern.
Defaults are 1975 for OpenTTD > r20003 or never for other versions;
you can still force such change in the graphics on a fixed date via this
param2: Choice of rail fences
0 = Use swedish rail fences whereever possible (default)
1 = Use fences only with SwedishRails rails (OpenTTD only)
2 = Don't change the fences, use the default ones
3 = Use no fences at all
4 = Use no fences for Swedish Rails only (OpenTTD only)
5 = Use non-CC fences wherever possible
6 = Use non-CC fences only with SwedishRails (OpenTTD only)
It is recommended to use in multiplayer games the company colour version
of the fences. It allows to find the owner of a piece of track more easily.
EDIT: Hm... in the ingame description? I'll see. But there's too little space to explain them IMHO.