Re: [Rails-devel] Train management

[Phil D. <de...@gm...>]

They aren't considered separately but going from memory the 6/4D
trains in 18Ardennes also work this way.  With the further restriction
that only 10 share companies can buy the 4D (presumably limit the
purchase of traincerts by company should be fairly trivial)

Phil

On 9 June 2011 15:10, Erik Vos <eri...@xs...> wrote:
> As announced before, I have been thinking about how to upgrade train
> management to enable some new features that currently can't be implemented
> (notably items 2 and 5 of the below list).
>
> I'm aware of the following cases to  be taken into account:
> 1. Normal trains.
> 2. Dual trains, as in 18VA, 18Scan and 1846 (these are the three games I'm
> aware of having such flip-side trains, and which have considered so far).
> 3. Initial trains (as in 18EU).
> 4. Fixed trains (at a cost, as some 1825 minors have).
> 5. Extra trains from a private special property (as in 18GA).
> Any others?
>
> The basic idea is to separate train certificates from actual trains.
>
> Train certificates are objects that can be traded.  Each certificate
> represents a potential train, designated by a train type object.  A dual
> train certificate represents one of two potential trains, and is therefore
> linked to two train type objects.
>
> Trains are objects owned and held by companies only.  Trains are no longer
> created at the game start, but at the time that a company acquires a train
> by whatever means.  The possibilities are:
> 1. Buy a normal train certificate: create a train object.
> 2. Buy a dual train certificate: ask the player what type is wanted (this
> can affect the price), and instantiate a train of that train type only.
> 3. An initial train as in 18EU is obtained by autobuying a train
> (certificate) at zero cost at floating time (similar to as it works now).
> 4. A fixed train as in 1825 is obtained by autobuying a non-tradable train
> (perhaps without a certificate) at nonzero cost at floating time.
> 5. The 18GA extra 2-train is not tradable and is not related to a train
> certificate. It is created when a company buys the OSRR private before phase
> 4.
>
> When a train is traded between companies, both the train certificate and the
> train object are moved.
> When a train is discarded to the Pool, the train certificate is moved, but
> the train object is destroyed.
> These two procedures are formulated this way to precisely implement the very
> explicit 18VA dual train rules: when a dual train certificate is traded
> between companies, the initial train choice must still be honoured, but when
> a train certificate enters the pool, that choice is erased.  As far as I can
> see, the 1846 rules are somewhat less explicit but no different. The 18Scan
> rules seem to be silent on this matter, but I assume the 18VA rules also
> apply to 18Scan. If anyone is aware of different cases, please let me know.
>
> Any comments?  Do other cases exist that I have overlooked but need be
> considered separately?
>
> Erik.
>
>
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