The MTA’s spending is like a runaway train.
The Metropolitan Transportation Authority’s board rubber-stamped nearly $250 million Wednesday for consultants in its already colossally pricey, long-delayed Second Avenue subway extension.
The mega-plan’s Phase Two to grow the Q line by 1.8 miles on the Upper East Side is expected to cost $7.7 billion — or an eye-watering roughly $4.3 billion per mile — making it one of the costliest subway projects in the world.
The lavish outlay comes as MTA officials plead poverty while pursuing an entirely separate, bank-breaking $68.4 billion capital plan for 2025-29…