We all know what happened when Boston decided to bury its downtown elevated interstate highway, known as the Central Artery. What was intended to be a seven-year, $2.6 billion project ended up taking a decade and costing $14.6 billion. Head’s up: New York’s Metropolitan Transportation Authority — the parent company of Metro-North — has similar designs for our beloved Grand Central. Nicknamed the East Side Access project, the goal is to bring some Long Island Rail Road trains into Grand Central. The plan would use the lower level of the already built 63rd Street subway tunnel, allowing some LIRR trains from Queens to enter Manhattan and then follow a new, very deep tunnel under existing Metro-North tracks beneath Park Avenue.