With any lift, you have a theoretical capacity, and the actual throughput in normal operations. This takes into account the speed, loading efficiency, and stops or slow downs. A fixed grip quad might have a theoretical capacity of 2400, but it might not run at full speed, have bad loading efficiency, and frequent stops. That could mean your throughput is only 1500 or so. Meanwhile, a high speed quad with the same theoretical capacity might have a well managed queue for near perfect loading efficiency, run at full speed, and have few stops or slows. When ordering a lift, the resort can specify whatever capacity they want, but most choose to increase it when replacing a lift. When Stratton replaced Snow Bowl, the theoretical capacity increased from 2000 to 2400, but I think the throughput increased by at least 50%, because the old lift did not operate at anywhere near its theoretical capacity.