I am designing a layout with 22in and 24in radius because the recommended minimum for a US 4-8-2 was 22in. However I am having extreme difficulty designing a fiddle area as the 22in minimum doesn't give me enough room for a fiddle area. Could I get away with set track, R2 or R3, for just the fiddle area and expect 4-8-2's, 4-8-4's & 2-10-0's to negotiate it. As a fall back I could use the fiddle area for diesels. multiple units and smaller steam engines and accept not running larger engines into the fiddle area.