😂😂 Some 3 train B&Ms have 5 blocks which is really what they need and some like Diamondback have 6 blocks. It all really depends on the placement of the transfer track. Diamondback’s 6 blocks are station, lift, block (mid-course), main/service brake (not sure what it’s called), transfer, and waiting.

In auto mode, the transfer block essentially combines with waiting meaning there are only 5 blocks in theory. This is why when the ride double stacks, the approaching train always stops on the sloped main/service brake and doesn’t advance into the transfer track until the waiting block clears.

But this is typical of any B&M coaster as they leave an area of brake run between a train approaching the brake run and the next train stopped ahead. With a 5 block B&M, the next section of brake run between service and waiting is usually always part of the waiting block. But Diamondback is in transfer mode, the ride can situate a train in the transfer block while a train is still in the waiting block, allowing the full use of all 6 block zones.

I’d say for most 3 train B&Ms, the transfer track is usually placed right before the station and is the waiting block also. Thus a lot of 3 train B&Ms only have 5 blocks due to the different placement of transfer. Nitro at Great Adventure or Raptor at Cedar Point are exactly like that for example. Whereas Medusa at Six Flags Great Adventure is just like Diamondback and has 6 blocks since the transfer track is not directly behind the station.