Unfortunately D&D is a game and not a physics engine so the RAW answer is that a Cart can carry an undefined amount.
If you are the DM then I would suggesting doing some quick research online to see what the real world answers to these questions are. Just keep in mind you ideally want historical information as modern techniques will be more efficient and likely do not exist in your game world.
If you are a player then this is a question to ask your DM.
About how many lbs could a single minecart hold, and how much coal could one extract in a day
Unfortunately D&D is a game and not a physics engine so the RAW answer is that a Cart can carry an undefined amount.
If you are the DM then I would suggesting doing some quick research online to see what the real world answers to these questions are. Just keep in mind you ideally want historical information as modern techniques will be more efficient and likely do not exist in your game world.
If you are a player then this is a question to ask your DM.
The vehicle rules don't have a carry capacity for land vehicles (weird right?), not that they have a minecart perse anyway.
Just use google.
I shall do that, thanks for the help