LocoFi'ed Bachmann Track King Train Set equipped with LocoFi 1st Gen (DDLLHA). The included LocoFi'ed diesel locomotive is a UP GP40. The DC only locomotive has been fitted with LocoFi module so that it's operable wirelessly using WiFi by the LocoFi app installed on your smartphone. What's more? It comes with sound! You can also put another LocoFi'ed locomotive on the same track and individually control each locomotive. No more fixed in one place and turning the knob to be able to only change speed. Here's the link to the original set: https://shop.bachmanntrains.com/index.php?main_page=product_info&products_id=7974