Thousands of brass model trains have been produced throughout the years. Initially their price was comparable to that of die-cast models, but the detail was far superior. The quality and details of brass models have increased with time along with its price. As of 2014, an articulated HO scale, highly detailed model may retail for as much as US $3000; larger scales can cost even more. The collectibility of late run highly detailed models, along with lower availability, generally keeps the prices high. Historically, the most desirable models have continued to rise in value. Mid-run (1960-1985) models, in particular unpainted models, have appeared to drop in value lately, as they are becoming less desirable in comparison with newer models with much better details. These models still often sell for several times the original suggested retail price.