What does that have to do with anything? It didn't get built until then because it didn't pay off to do it before then, not because the Australians are incapable of building railroads!
Where was it claimed they didn't know how to build railroads? The citation of 2004 is pretty obvious; it's expensive and hard to build a railway several hundred miles long through desert. That the Allies went for a road instead of a railway despite the extreme dangers of 1941-1944 speaks volumes.
If Darwin is captured, it then it pays off and is built. One change in TTL is that Darwin has rail connections much earlier.
Sure, but it's going to take until at least 1944 to complete it. Speaking of which, where does the materials come from and who pays for it? Australia certainly can't manage it and the U.S. is already supporting the Soviet railway network in addition to its own and other allies.
You seem incapable of figuring out that the Wallies will change their weapons locations and logistical capacity if the situation changes which was far from the truth. Allowing the Japanese to change things while the Wallies are incapable of doing such puts the finger down hard on the Japanese side of the scale!
No, I'm pretty sure I've never stated anywhere or even suggested the Allies cannot change anything or that only the Japanese can. As I've stated from the very beginning, it's going to take until 1943 or 1944 to be able to mount an offensive against Darwin. There's no nearby Allied air bases, so those will have to be built up to cover building the logistics net for such a move; as pointed out earlier, it took until 1944 just to get an all weather road and its capacity restrictions severely limit it's usefulness. To get a railway is going to take much longer, given the resource needs of that are much more intense.
The Allies could do the end run around it and attempt a sea invasion, but, again, they'll need to build up air and naval bases to support such. Approaching from the West is pretty much impossible given the lack of sufficient port facilities outside of Perth and then having to brave the Torres Strait with Japanese air superiority. Approaching from the East means the nearest port is Townsville, so again you'll need to build up air bases, otherwise the Japanese have air superiority.
Being someone who actually learns from history, I'll just leave this here.
https://www.ww2places.qld.gov.au/places/?id=1065
Unlike the Nazis, the Allies were actually *good* at logistics ... and remember, they did this without an invasion to throw back.
You might want to read the dates, which stipulate it was finished in
1944 as well as the capacity limitations and technically hurdles.
Even if it was as easy to throw air raids against Townsville as it was from Rabaul to Guadalcanal (which had its own problems OTL), wouldn't this just create an earlier opportunity for a war of attrition against the Japanese for allied forces? And over much better air bases than Guadalcanal? Allies can always ship more planes and personnel to bigger Australian harbors and move them to combat via land. And as an added bonus the Japanese aviators would face off against far more numerous USAAF pilots and planes than the marines had in Guadalcanal.
Of course there is the option of sticking to smaller nuisance raids, but there was this capability in OTL anyways with longer range flying boats.
Absolutely, hence why I've repeatedly said 1943 or 1944 is the end date for Japanese Darwin. People seem to conflate "Japan does better" with "Japan wins" in this thread.
The original timeline allies were trying to demolishing airstrips, in February 1942, once the Imperial Japanese landed (and indeed in this case they succeeded.)
Yes, said airfields were back in operation rather quickly however and used to launch raids on Australia.