Sanji does not get knocked out by Lucci and CP9 on the train in that scene; he actually infiltrates the Sea Train, clashes with them, and keeps moving through the cars. He later reaches Enies Lobby through the train operation that the Straw Hats and allies use during the Water 7/Enies Lobby rescue mission.

What happens on the train

Sanji boards the Sea Train to help rescue Robin, then runs into CP9 and ends up fighting while the others maneuver through the cars. The action gets chaotic fast, with the crew splitting up and trying to keep moving toward the mission’s goal.

How he gets to Enies Lobby

He gets there as part of the Straw Hats’ wider plan involving the Sea Train and the ship that follows it, not by being transported alone after being knocked out. The train sequence is one of the key steps in the Water 7 arc that leads into the Enies Lobby conflict.

About “Suzu”

I couldn’t verify any One Piece character named Suzu from the sources I found, so that part may be a name mix-up or from a different series. If you meant a different character, I can map out exactly what happens to them.