So,

$RESOURCE_TRANSPORT_TYPE RESOURCE_TRANSPORT_GENERAL
$RESOURCE_ALLOW_ONLY plants
$RESOURCE_ALLOW_ONLY plastics
$RESOURCE_ALLOW_ONLY cement
$RESOURCE_ALLOW_ONLY alumina

Would allow transport of cement or alumina in addition to crops or plastic, BUT the capacity of the dry bulk is reduced as compared to a dedicated dry bulk hopper (31 tons of cement to 55 tons of crops, vs 69 tons of cement for RESOURCE_TRANSPORT_CEMENT).

So I personally would leave it as you have them now - crops and plastics are both 'clean' and light commodities, cement is dirty and dense. Would be better to make dedicated low volume (2 or 3 bay), high tonnage cement hoppers later. My understanding is also that cement would more or less put an Airslide hopper permanently in cement service, due to the fabric liner.

But the above is how you can make any combination of open hull, covered hull, dry bulk, or cooler goods, should you need the information.

Love your cars

Neat. Well done!

American, however still great. Thank you!

Thanks, can you make us some early game american diesel locos? Like 1930-1950.

Ah yes, I ran into the same issue trying to make a silo hold crops and dry bulk having 2 storage slots instead of one shared slot, though i did not try doing it with a vehicle. Nor did I try it as "plants only + cement only + alumina only" but as "dry bulk + plants only". I'll mess with something tomorrow as a test and see what I discover.

I could add a cement variant but I believe it would have to be a separate wagon ingame, I don't think you can make something carry both "dry bulk" and "covered" resources. I'll think about the plastics though. I always imagined them more as a generic plastic component rather than a bulk material, but pellets make more sense, considering the ingame icon and all.

nice work!

Wouldn't it be appropriate for the 50t hopper to also carry cement and alumina, being a converted coal hopper? (So heavier materials would be suitable). Any could also carry plastic pellets.