This is correct, the 2 swings are essentialy 2 completely seperate machines and can be operated individually.
The only synchronisation they have is that they both operate the same program from a single button press. If they get too far out of sync, an alarm is triggered.
As I stood watching Kennywood’s “Swing Shot” this summer I noted with interest the fairly prominent “HUFF” at the exhaust stroke. I guessed that the ride was pneumatic as confirmed here but along with the “HUFF” I noted that the air being discharged had a darkish coloration, greyish iirc. It reminded me somewhat of a car engine running rich.The only one who could answer that is whoever wrote the program for it back in the US, but it isn't an air supply limitation.
The compressor runs all day long without stopping, the only thing that changes is the load state. If the supply pressure is below the setpoint, the bypass valve closes and sends air into the system. Once the pressure reaches the setpoint, the valve opens allowing air to pass through the compressor stage and back to atmosphere without being compressed. This means you can keep the motor spinning even though you don't need more air as stopping and starting a 200Kw motor every few minutes or so would earn you a strongly worded letter from your power supplier.
To give you an idea of just how quicly the air compressor works, the 2 large air tanks either side of the tower holds enough air for about 2 swings before a low pressure alarm is triggered.
I had considered it might be brake dust or exhaust from a modern version of a hit or miss gasoline engine (which is oxymoronic but I was in overdrive trying to understand what I was seeing. )
Any thoughts on what causes this tint to the air?