GoEuro, a Berlin startup that offers travel comparison services across a range of different transport modes, has picked up an undefined multi-million dollar investment from Lakestar and a bunch of other investors, including American Express(s axp)’s former global business travel chief, Charles Petrucelli.

I’ve covered GoEuro a couple of times before – along with other startups such as Waymate, it’s tackling a horrendously difficult problem. It’s not easy to mix and match data from sources ranging from airlines to train and bus station schedules; you have to build relationships with all the transport companies, who rightly see their data as a valuable asset.

As Lakestar partner Klaus Hommels said in a statement:

“When I first met the GoEuro team, I was amazed at their ability to build relationships with large organisations that historically have not given out proprietary information. By building these relationships, they are breaking down a huge…