If DTG is looking for a short Nozomi Shinkansen route then the hop between Shin-Kobe and Shin-Osaka or potentially Kyoto would be a perfect fit! The distance between Kobe and Osaka is around 31km and gives you 15 minutes of Shinkansen driving, while a trip between Kobe and Kyoto is 85km in length and provides 29 minutes of high-speed driving, including non-stoppers which allows you to reach maximum speed. There are also several JR West lines that run alongside this, providing a stopper service at all towns and villages en-route. The Shinkansen has always been a popular route with railfans, being the first high-speed rail network to revolutionise rail travel. No simulator has ever done it justice, nor have we seen many attempts other than a few Densha De Go! games in the early 2000s. Below I have pasted a Google Maps screenshot of the route. The distance, timing and service options would absolutely fit perfectly with DTG's current ethos of medium-length, high-variety packages!