naw its different. the railway rifle shoots nails the railgun shot a frickin hole in you about the size of a bowling ball. back on subject though (thread might get deleted) what would you like to see in the next fallout (if it was like the enclave)
sorry, i have a tendency to follow tangents. back on topic.
i think a diversion from the US mccarthy-era satire, by placing it in another nation/area where nuclear war tensions were high(berlin/europe...moscow?) might be fun. it would take painstaking research on the developers' part to make it draw a player into it like fallout does. they'd have to really research the nations'/region's history.
also, the enclave idea is a good one...instead of starting in a vault, start on the exact opposite position of "we're the legitimate govt now, bow before us". but then again that can almost be accomplished through karma and quests in fallout 1/2/3 already.
i have not yet figured out if there are vehicles capable of being driven/flown/whatever in fallout 3, as you could acquire a car in fallout 2. i have come across a 'motorcycle gas tank' in fallout 3, which hints that there may be a personal vehicle to speed up travel over the irregular wastes...but i'm not that far yet. i spent most of today trying to find three dog and the GNR HQ cuz i got lost.
a definite though would be more weapons, more pipboy options(the radio is great, more things like that); and my dream would be a HUGE world map, which spanned multiple continents, or at least an entire continent, allowing the player-character to sample the post-apocalyptic flavor of survivors from various regions of the globe, and their new attitudes due to the world being a radioactive sess pool.
however this doesnt require a new fallout, more like a large fallout 3 expansion.
my 2 cents anyway.