Grab the Remote Hack Dart on the stairs and equip the Hack Tool. Stay out of sight and fire a dart at the malfunctioning Security Bot in the room up ahead. Once hacked, the Security Bot springs to life and takes out the two Splicers trying to fix it. Go through the hallway to the right to find your target—the Gatherer’s Garden vending machine!
Even though you came for the Incinerate! Plasmid, you now have the 160 ADAM necessary to buy all three items regardless of whether you chose to rescue or harvest the Little Sister that you dealt with earlier. Keep in mind that this is the only time during the game where your actions regarding the Little Sister won’t affect your ability to shop at the Gatherer’s Garden. Purchase the Health upgrade and EVE Link items, too.
Thaw the Frozen DoorSinclair told you that you need to melt the ice that blocks your train from leaving the park. The frozen door is located in the train station, in front of the train you arrived on. Head over there and use the Incinerate! Plasmid on the frozen door. 
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You hear that scream? That’s the telltale sign that a Big Sister is on the way. This fight is to the death, and you only have a few moments to prepare. Switch to Heavy Rivets and purchase any First Aid Kits and EVE Hypos you can from the Circus of Values machine before approaching the door to Rapture Museum.