Setting for loading speeds

[blincster]

On big projects, loading/unloading times is the limiting factor. Please make a setting that people can choose faster loading/unloading times.

[jfs]

Loading and unloading speeds of cargo are controlled by the vehicle/NewGRF.

[Hyronymus]

Loading and unloading speeds of cargo are controlled by the vehicle/NewGRF.

And can it become subject to a NewGRF variable?

[jfs]

I found two GRFs among those I have installed that allow you to control the loading speed:
2cc Trains in NML 3.0
Japan Set3: Trains

There might be more too.

So, it's definitely possible, but there's a lot more that don't have it as a setting. For many it's also a point of balancing the choice between different wagon/vehicle variants. Like maybe a set offers vehicles that offer a tradeoff between weight and loading speed, or running cost and loading speed, or other parameters. I remember one road vehicle set where double decker buses offered superior capacity but much slower loading times.