CHICAGO — The Red Line train rumbles in and out of Wrigleyville at all hours of the day and night on its way to the nearby Addison Street station, the ka-thunk, ka-thunk, ka-thunk giving the Cubs’ neighborhood ballpark a steady — if irregular — heartbeat.

The Red Line might as well refer to baseball’s postseason.

This is the time of year when pitchers are asked to push beyond their physical and mental limits, to throw as hard and focus as intently as they ever have, even as the stakes continue to climb. To redline their arms and minds until the manager takes the ball away.

This is the time of year when men — OK, one man: Mason Miller — are capable of throwing a baseball 104.5 mph.

“The adrenaline helps,” Miller said.

The Padres’ relievers delivered on Wednesday, working a combined 5 ⅓

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