My copy of classic arrived in 10-11 days here in Alberta from Brisbane Australia, which in my humble opinion, is phenomenal!
I have been 'lucky' and been able to download some TRS 2004/2006 into Classics from the DLS. I even managed to 'fluke' a BN F45! Given time, I would assume (or hope...?) that some of the excellent content for 2k4/2k6 will become fully compatible with the Classics game engine, given time of course.
I have imported some content from TPR and it appears in the 'railyard' with no issues. I have not tried to download any custom routes as of yet. I have played with the 'Surveyor' option and it seems to work OK, at least in the 'undec' grid.
FWIW...Ken.