While the idea of a three-country Hyperloop might seem extreme, the distances between the three cities is actually fairly trivial. Vienna to Bratislava is a 35-mile straight line, or 50 miles by current transport routes. Bratislava to Budapest is a 100-mile straight line, or 125 miles by transport. Both are well within the realm of possibility.
HTT suggests the Vienna link would shuttle passengers between the two cities in eight minutes, while the Budapest link would take ten minutes. It also believes there's potential for a link with Slovakia's second-largest city, Košice, which lies 248 miles away. All three possibilities are just that: possibilities. This agreement will assess the viability of each, and put forward a (hopefully fully budgeted) proposal to be financed.
HTT is one of two entities seriously pursuing the Hyperloop dream. It's crowdsourced not in the Kickstarter (i.e. finance) sense, but rather in the spirit of collaboration between independent scientists, designers and engineers. The group is currently planning to build a five-mile test loop in the California new town Quay Valley, which it hopes will be operational in 2018. The similarly named Hyperloop Technologies is backed by venture capital, and has broken ground on a test site in North Las Vegas, Nevada.