Running costs - Base cost factor for vehicles

[gesia]

Hello,

I'm currently trying to rebalance some NewGRFs against each other. I've read basically all of the relevant specs (http://newgrf-specs.tt-wiki.net/wiki/Main_Page), or so I think. However, I still don't understand the running costs of vehicles yet.

According to the spec, for trains, the base value (referenced using prop 0E) is multiplied with the cost factor (prop 0D) to get the actual running cost. That seems trival, however in the 2cc Trainset v2.0.0 Beta 5 I find a lot of entries like this:

15328 * 84 00 00 1F 01 FF C5 08 02 01 03 28 04 19 05 00 06 07 07 0A 08 00 00 00 00 2A 4B C7 0A 00 09 73 00
0B 40 06 1B 00 00 1F 28 16 4B 24 00 20 20 14 00 15 00 1D 00 00 00 00 28 0B 00 29 F0 03 0D 00 0E
30 4C 00 00 17 00 1C 00 12 FD 19 00 13 00 1E 12 21 00 27 02

So the running cost of all these engines should be 0, which is not the case. I Have already considered the possibility of an action 07/09, but I haven't found any that would affect, for instance, this line - or maybe I missed them.

Is there another way of setting the running costs which I am missing?

Thanks in advance for any pointers.

[planetmaker]

You might have more joy by looking at the actual source which is quite well documented than some de-compiled, uncommented code

The property for running costs is indeed set to 0 for vehicles in the 2ccTS. It is set to different values via callback 0x36 depending on circumstances.

[gesia]

Thanks, the callbacks are what I was missing.

Looking at the source the only point in using a callback for running cost is to make the running cost lower while the vehicle is standing still. Is that correct?

[planetmaker]

Thanks, the callbacks are what I was missing.

Looking at the source the only point in using a callback for running cost is to make the running cost lower while the vehicle is standing still. Is that correct?

Without going through all the code of that set, I believe that that is the intention, yes.

[gesia]

Well, thanks a lot for taking the time!