This stream runs about 63 minutes. It opens on a card reading "Hypermine Vanilla SMP" and "Basket Station Departure Gate" with no episode number, so the number here comes from the playlist. The passenger cart wall at Basket Station already sends carts out, but the spots where they come through are big open holes in the wall. This stream covers them with blocks that move out of the way when a cart leaves. Basket is the only player on screen.
Redstone on camera
Basket didn't get to this off camera, so "we're going to do a little bit of redstone today." The scaffolding from last time goes back up and part of the build moves down a layer. The plan: a cart starts at the bottom, runs up a slope, and hits a rail that sends a signal to sticky pistons, which pull back the blocks covering the opening.
The first press of the button does nothing. A rail was never powered. "I did mention that at one point that I would have to make this be powered. Didn't do it." Basket powers every other block, careful not to set off a piston by accident, and tries again. This time a cart sits there and won't move.
A dispenser on the floor
Basket's guess is that a cart dispensed onto a sloped powered rail rolls back into the dispenser instead of climbing. To check, Basket builds a small test out on the floor. There's no spare dispenser, so some string becomes a bow and the bow becomes a dispenser. The test agrees: the cart has to start on flat track.
Flat track means the piston can't stay where it is. A viewer suggests moving the whole back section up one block. Basket says no: "That's a lot of redstone over there. It's not worth it." Instead the wall comes out one block. The worry is the granite stripe, which looked better flush, so Basket asks the chat how it looks and settles it: "Okay, so let's stick with this."
Eleven pistons
With the wall out, Basket strips the old layer to see how much room there is and sets the sticky pistons in their new spots. Every other spot gets a lever on a raised block to power the rails. The spots in between get a detector rail whose signal runs down through torches and repeaters.
The first real test works, mostly. The cart pops out. "I got sort of pushed, which is kind of scary." The gate also closes too fast, so a second layer of redstone keeps it open longer. Basket counts eleven sticky pistons needed, has two, and crafts nine more, plus a stack of repeaters.
Then Basket spots a problem before it happens. Powering the line from above would keep firing the dispensers, and "it would empty all my carts, then I'd have a sad day." Repeaters facing inward fix that. The last gate in the row doesn't work at first because the redstone never reached that far. A torch and some dust later, it does.
The final test works. The extra carts get bumped down the line, where they turn and go straight back into the system. "So now I don't have those big open holes that were ugly, which is the whole objective."
Planning the second floor
With time running short, Basket goes up top to see how the new wall looks from above. The slope will curve in a block sooner to give the wall an arc, with the granite running vertical on the slope and maybe horizontal again higher up. There could be offices over the mechanisms, though "there'll be some clicky noises every now and then." Upstairs walkways will be three wide, with a bridge across like the one below, maybe two big stores, and stairs up to the offices.
Basket runs the gates one more time for anyone who missed it, and the stream ends. The credits run to the end with no gameplay after them.