They do, or did, make 027 track in 072 curves. I have some in use, it may be K Line, not certain, right now. Use Gargraves switches with correct conversion pins for 027 track, you will like it. For my Lionel PW rolling stock, and engines, I use a synthetic auto product called "Prolong". It works great, several PW engines, steamers (2035, 2036, 2046, 2055, 2056, etc.) all coast for over 10" where they used to come to a pretty much dead stop when power is cut. Use it on all my stuff, including non-train items around the house. Oh, also in the cars.
Jesse TCA 12-68275