Every November, the Keystone Crossings site conducts a PRR HO Scale Modeler's Needs Assessment Survey. The survey asks respondents to indicate their top three desired models in each of several categories, including steam power, diesel power, electric power, freight rolling stock, passenger rolling stock, etc. Each category is pre-populated with several choices that "a committee" feels are among the needed. Survey results are sent to several dozen manufacturers. Though our survey is unscientific, and doesn't take into account quantities each modeler may desire, we have noted that each year many of our top desires are announced as products within 12-18 months. So perhaps this data provides a "pulse point" to the industry. If you are a Pennsy modeler, please visit http://pennsyrr.com .
