I am interested in taking some of my sons die cast toys and pairing up with my MTH RailKing cars to make something custom. 

Trying to keep sizing realistic, anyone know what the size ratio is for RailKing? 

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Some RailKing locos are labeled "near scale" or "RailKing scale."  These are very close to 1:48.  Many of the steam locos are free-form and not strictly to any scale.  They are smaller than full-scale O (1:48), but larger than S (1:64).  So you could approximate with a number like 1:50 or 1:54.  Hope this helps!

Creep, coast, and pull.  We're not talking about cold fusion here.

If it says "RailKing Scale", it is a 1:48 model using old Premier tooling that does not meet the detail expectations of the current market. (These are almost all diesels/maybe electrics, and can represent real bargains, even when new. The RK USRA 0-8-0 is a 1:48-sized model with basic detailing.)

Most non-scale RK items - and that is nearly all of them - are not "proportioned"/scaled to any precise ratio, it seems. Some are toy-like, some are better-toy-like and some are very presentable. I always mention the RK Triplex here, which has scale-sized cab, cylinders, pilot, general girth and so on that are found on a shorter machine with smaller drivers - it looks like a 1:48 model of a smaller Triplex. Very nice piece.

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