The roads, rails, bridges, ports and airports that make up the nation's transportation network are the backbone of our economy. Without reliable and efficient means to transport goods and people, our economy will be fettered. This year, Maryland made tough choices to invest dedicated funding for the improvement of our highways and public transit — including the proposed Baltimore Red Line. Now, Congress must act to support President Obama's Rebuild America Partnership and his proposed National Infrastructure Bank, which will leverage private-sector investment to bolster America's infrastructure — including transportation projects of national and regional significance. This is a bipartisan idea that deserves the support of Republicans in the House of Representatives.