On our last game something came up that was somewhat surprising. At least the way we interpreted it. So to clarify:

A WE (in this case a Land Train with 5 DC) that's got EA both in CC and FF (let's say +3 EA CC and +3 EA FF) that is engaged in an assault:

- If no enemy unit in CC it gets 5+3 dice in FF
- If all enemy units in CC and none in FF it gets 5+3 dice in CC
- But if there are enemy units both in base to base contact and in firefight range it gets 5 dice either for CC or FF + 3 dice in CC + 3 dice in FF.

Are all these correct?

Not quite. As a WE, you get the DC in dice - 5 in your case - but the Extra Attacks relate to a weapon. The weapon must be used in a given mode, either "base to base" or "small arms", to gain the Extra Attacks. In your case you get 8x dice because you have suggested that the unit gets EA(+3) for both CC and FF.

However consider the Eldar Phantom titan with a Power fist, which has three stats
30cm 6x AP4+ / AT4+
OR (small arms) EA (+3)
OR (Assault weapon) TK (D3), EA (+2)

Here, you get different numbers of EA dice (and effects) depending on how the weapon is used.

Ok. So the key words are OR, AND ?

The WE in question was a Land Train with 3 Berseker Cars with:
Berserkers (15cm) Small Arms EA(+1)
and (base) Assault Wpn EA(+1)

Thanks

Ginger is correct as far as how weapons work in general and how to parse out there abilities in different situations.

In this case, if the data sheet for the cars says "AND" then you can use both modes simultaneously. Your original post would be correct as far as counting up attacks.