From the email
Hot off the plane from the factory is our working sample model, (commonly known as the Engineering Prototype) of the RTR Kerr, Stuart "Victory" in 00 gauge.
This is a hand-finished example, made from the all the metal and plastic tooling parts that will eventually be put into mass production, to check everything fits together and the mechanism performs as expected.
One thing that has struck us immediately is how hefty and well engineered the model feels. It's a large loco, around the size of a 57xx Pannier and considerably bigger than the Hornby B2 Peckett which might be your benchmark for a six-coupled industrial. It tips the scales at 237 grams and details like the coupling rods have a convincing thickness - these are solid metal castings rather than thin stampings or etchings.