Been thinking on the ranges
Short range, being not ocean hoping in war time, is probably under an Atlantic crossing of 3,000 km.
If a short range ship had 4,500 km of range then the game would let it change from Northern Europe to North American East Coast woudn't it? but it doesnt.
the break from medium-long is certainly debatable. The devs might give us their views but until then its hand waving around game affects.
An updated version might be:
Short range 0 to 3K (can't cross the atlantic)
Medium 3k to 8K (suitable for ocean transit and a few operations)
Long 8 to 16K (US Pacific designs still fall in this)
Extreme ~24-32+K (No longer cares and might circumnavigate)
Id be curious what British ship design fuel ranges were.