RMT is coming out with a new Snap track switch in 031 and 072 sizes. Hopefully these switches will be better than the new(made within the last 18 years) Lionel switches.
K-Line also made some switches in both remote control and manual control for 042 size curves. I think K-Line made 031 switches but I am not sure, as I have not seen one recently for sale.
Lee Fritz