My son's basement layout has the bachman curves- Aristocraft's Lil Critter and FA work fine but the RS-3 pulls the cars off in the curve; I read the FA requires 4'radius & the RS-3 and U25 need 5' radius- my question is what does the USA GP-7 or GP-38 require? Thanks for any and all input.
I'm sure that 5'radius will work. On our layout we use the 10' radius. In the yard however we have curves below the 5' and we have no problems either with the GP38 or F3 ------------------ Paul the 2nd Paul Van Herwegen HO Rappannahock Terminal Railway G Emerald Valley RR http://home.beseen.com/hobbies/trainfreak/poncayard.html