Re: Train running cost

Hi,

Better equations:

For steam engines:

Train runing cost = (MC * NL) + ((LC * NL)/R) + (WC * NW) + (AR * TS)^2

For electric/diesel engines:

Train runing cost = MC + ((LC * NL)/R) + (WC * NW) + (AR * TS)^2

where RL=reliability of engines

Because older engines may be more expensive than newer engines.

PD: (a*b)^2  != a*(b^2), since (a*b)^2 = (a*b)*(a*b) = (a^2)*(b^2)

El Dimecres 02 Novembre 2005 12:37, Jaume Sabater va escriure:
> Hi all!
>
> I think that actual train runing cost calculation can be more realistic.
> For example:
>
> Train runing cost = MC + LC * NL + WC * NW + AR * TS^2
>
> where:
>
> MC=Maquinist cost. This is a constant cost of 1 or 2 maquinists
> (traindrivers). Steam locomotives should have 2 maquinists per locomotive,
> electric and diesel engines should have only one per train, because
> multitraction won't need more traindrivers on electric and diesel
> locomotives.
>
> LC=Locomotive cost. This cost should be a variable cost, depending of % of
> power that a locomotive need for move a train. For example, a 5000cv
> locomotive with 2 wagons should have less running cost than a 5000cv
> locomotive with 10 wagons. Locomotives jumping mountains should have great
> runing cost than locomotives running on flat.
>
> NL=Number of locomotives.
>
> WC=Wagon cost: This is a constant cost for every train carriage.
>
> NW=Number of wagons
>
> AR=Air resistence: this is the costant aerodinamic resistence for a train.
> Inside tunnels this constant should be greater than outside.
>
> TS=Train Speed: Speed of train.

-- 
Jaume Sabater

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