The conventional wisdom across Europe these days is that entrepreneurs should think globally from the start. But GoEuro, which operates only in Europe as its name suggests, announced today that it has raised $ 70 million in a round led By silver lake Kraftwerk, a Fund run by Silicon valley’s Silver lake, and Kleiner Perkins Kaufield

This follows another $45 million round the company raised last December, bringing its total to $145 million.

“Investors are looking for a few key ingredients,” said Naren Shaam, CEO and founder of GoEuro. “European travel is a $ 50 billion market and it’s still mostly offline. So you can create a very big consumer brand here.”

GoEuro was founded in 2012, although in fact the service was only launched the following year. The company allows consumers to book trips through a patchwork of trains, buses and local vehicles that stretches across the continent. The company has 500 transport partners in 12 countries.

This may not sound like much on the surface, but actually signing up each partner and connecting their disparate systems is a huge logistical challenge. Each national rail partnership can take up to a year to negotiate. And keeping all the data on these platforms in a single format is a big engineering challenge.

Shaam noted that 80 percent of train tickets are still bought at train stations. With 500 million travelers a year, the opportunity for a company solely focused on Europe is huge.

GoEuro currently employs 180 staff, of whom 46 per cent are women. Shaam said the company will continue to hire and will also use the money to continue to add countries and significantly improve its mobile experience. He said 70 percent of the company’s 10 million monthly users are on mobile platforms, but he still wants to do better shopping to attract more of those offline ticket buyers.

Looking down the road, Shaam said he wasn’t sure the service would make sense in the U.S., where rail and bus travel isn’t as popular. But he said the South American and Asian markets could be attractive targets, after all.

The company did not release an estimate, but said in a press release: “GoEuro is currently poised to join a narrow circle of European start-UPS seen to have the potential to become multi-billion dollar companies.” Other investors in this round include Atomico, Battery Ventures, Goldman Sachs Investment partners, Lakestar, and NEA.

“I’m glad they’re making this bet in Europe,” Shaam said. “Because I believe Europe can create a lot of $ 10 billion-plus businesses.”