Athearn HO scale EMD GP38-2 Scale: HO (1:87.1) Price: Direct-current model with 21-pin NEM connector, $229.99; with dual-mode SoundTraxx Tsunami2 sound decoder, $329.99 Era: 1970s to present ...

HO scale model trains are a significant part of model railroading history, and we can partially credit the overall popularity of model trains with the rise of a convenient, tabletop scale like HO.