Our HO group in Yuma Arizona loves our new Rio Grande GP35 and we have ordered a second unit. Any chance of EZ App in a newer and larger diesel, like our favorite, the Southern Pacific GP60? We'd want four, ASAP if they were available. Newer diesel units in SP, UP and BNSF will attract more interest in EZ App.... Guys, you'll love walking along with your train using an inexpensive Android as a controller. Bobber in Yuma