A comparison of a Railking Union Pacific Offset Steel Caboose vs. a Premier Union Pacific Offset Steel Caboose. Both have the same dimensions, interior illumination and the same weight.
1. Cupola - RK has molded in detail of hand grabs; Premier has raised, separately applied hand grabs, and antenna.
2. Side View - RK has molded-in, unpainted hand grabs, and minimal graphics. Premier has a brakeman in the cupola, separately applied, painted hand grabs, and more graphics.
Rear End On View - Premier has warning light and road number on edge of roof, plus additional painted and separately applied hand grabs.
Front End On View - same as rear
Undercarriage View - the same on each car
The difference in details is noticeable, but not glaringly so, when compared in a static display. Moving along a layout, even less so. I think the biggest detail discrepancy is the absence of the UP shield on the RK caboose, which can be easily rectified with after market decals.