I have an Idea.
What are you thinking about adding an difference between engine types (Adding new types) Water Tender or general tenders .
It would be nice if at emergency calls are different mounts of water are needed.
An burning leave doesn't need as much water as an Harverster Fire.
Sorry for my bad english but I am from Germany and my computer language is german so the full text is underlined in red. This is very confusing