For the terminal station, the question is the number of services that might start or end at the station.

Let's look at CHSRA's figures in this projection (page 5/pdf page 9). It's only for Phase 1, but at full capacity, and foresees a more complex service pattern than you (one more comparable to SNCF's and JR East's service pattern than say RENFE's). The table for peak hours is formulated a bit confusing about frequency, so I re-calculated it for every two hours and every direction:

1. (express with multiple stops only in the megapolises): 1 train
2. (express with stops only in 4 main stations): 2 trains
3. (semi express, with more stops in the Central Valley): 1 train
4. (semi express only to LAUS, with evenly distributed stops that include Sylmar): 4 trains
5. (semi express only to LAUS, with evenly distributed stops that include Palmdale): 4 trains
6. (semi express, with more stops nearer to LA): 1 train
7. (all-stations SF-Merced): 3 trains
8. (all-stations LA-Merced): 3 trains

That's 16 trains from TBT every two peak hours, or 8 every hour.

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