Issue description
Hard to say if this is a suggestion or bug, but with the advent of hydrogen as truck fuel in previous updates, we still only have one fuel input port in the Vehicle manufacturing depot. There are reasons why I would run both diesel and hydrogen vehicles in the same map, produced from a single depot. So, I either have to keep truck deliveries enabled on the depot (which I don't want to do), or I have to delete my hydrogen input pipe to replace with a diesel pipe and then back again based on demand. There is space next to the existing fuel input to add a second one without much graphical changes. Thanks!
Reproduction steps
Just plop a depot and you can see the issue....there's only one pipe in, but two fuel options for vehicles. :)
Game version and build number
v0.8.0 b548
Operating system
Windows
