CTA Bell

At CTA stations, the end of the track should be terminated with a pressure plate to trigger note blocks. Here's how you do it:

FUCK REDDIT!!!! SUPPORT AVO!!!

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Step 2: Dig bell room

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Dig down 3 blocks, so the roof is the same level as the tracks. The block containing the redstone should be 2 blocks above the floor of the room.
Dig out a room that contains both of the redstone "towers", and make it large enough (at least 10x20 blocks)

Step 3: Lay redstone

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Connect the two pieces of redstone into a single wire.
Create a fork partway through the wire, and fork it out to two pieces of wool. The wool is important, as it will make a bell noise. The redstone must be directed at the wool, otherwise, the bell will not work.
Do the same on the other side, except make the wool at least 5 blocks away from the wire. A delay circuit will go here, and it needs a little bit more room.
Place 2 blocks halfway in the wire you just made. Ideally, to get the most delay, the two blocks should be facing north-south.
Place redstone torches as shown.
Place redstone wire on the last block.
Place a block on top of the redstone torch as shown.

Step 4: Note blocks

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Place note blocks on each of the 4 wool blocks.
Tune the two note blocks not connected to the delay circuit to A (15 clicks) and E (10 clicks) as shown.
Tune the two note blocks connected to the delay circuit to F# (12 clicks) and C# (7 clicks) as shown.