The train keeps rolling at 1 Penn Plaza.

The Knicks made it five straight wins and remained undefeated at Madison Square Garden (7-0) with a 133-120 rout of the Memphis Grizzlies on Tuesday night — and they did it without starting center Mitchell Robinson, who sat out the first leg of the back-to-back under his left-ankle load management plan. Robinson is expected to return Wednesday against the Orlando Magic.

Without their anchor in the paint, rim protection was shaky at times. But it hardly mattered, because Memphis — mired in dysfunction — didn’t put up much of a fight. The Grizzlies looked as lifeless on the floor as their current situation off it with All-Star guard Ja Morant, whose frustration has become the team’s defining storyline.

That, of course, isn’t New York’s concern.

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