Increasing Shuttle Bus Services to the MTA Railroads. Metro-North Railroad (MNR) and Long Island Rail Road (LIRR) riders have difficulty finding parking at many stations. Commuters typically arrive earlier and walk farther to find a parking space, while discretionary riders are left with few spaces remaining after the daily commuter rush. The lack of available parking is one of the greatest constraints to increasing ridership on the railroads, yet building more parking spaces is not a priority for communities for many reasons.