I purchased several boxes of supersnap 30" and 40" sections at a good price from RMT years ago and began the process of replacing my tubular track as I liked the look of supersnap track. Dealers like Trainz sold 31" switch track at a pretty reasonable price and I used them on my 9' by 12' layout. Curved track were harder to find and I couldn't find 054 ones so I settled for 042. Every once in a while I do see 072 curves and 072 switches. 031 curves are still available.
There is something called shadow rail with the same darkened center rail but they are attached with track pins. I did hear that some Chinese company has had a large inventory of K-Line stuff and RMT gets a shipment now and then. EBay sells supersnap but prices are rising and when you add ridiculous shipping costs there are no bargains.
Are there corporate headquarters for 0-Line and perhaps they can come forward with what they actually do and what their future plans are. I am still in the market for 042 and 054 supersnap curves so anyone out there have some?