Workmen building a massive casino on the Everett side of the Mystic River can easily see the bustling MBTA station on the opposite bank in Somerville, a mere 500 feet away. But to get there requires a circuitous trek over some of Greater Boston’s most congested roads.

Workmen building a massive casino on the Everett side of the Mystic River can easily see the bustling MBTA station on the opposite bank in Somerville, a mere 500 feet away. But to get there requires a circuitous trek over some of Greater Boston’s most congested roads.