Table:
text: List of busiest Amtrak stations
List
List
Rank_ Station City State_ Boardings_and_deboardings
1 Penn Station New York City New York 8995551
2 Union Station Washington District of Columbia 4850685
3 30th Street Station Philadelphia Pennsylvania 3872392
4 Union Station Chicago Illinois 3393695
5 Union Station Los Angeles California 1606121
6 South Station Boston Massachusetts 1360162
7 Sacramento Valley Station Sacramento California 1175046
8 Penn Station Baltimore Maryland 953170
9 Albany–Rensselaer Station Rensselaer New York 769626
10 Union Station San Diego California 753739
11 Union Station New Haven Connecticut 740902
12 Wilmington Station Wilmington Delaware 717772
14 King Street Station Seattle Washington 672485
15 Union Station Portland Oregon 665677

text: List of busiest Amtrak stations
List
List
Rank_ Station City State_ Boardings_and_deboardings
13 Penn Station Newark New Jersey 683626
17 BWI Airport Station Linthicum Maryland 662453
16 Irvine Station Irvine California 664263
18 Providence Station Providence Rhode Island 625995
19 Milwaukee Intermodal Station Milwaukee Wisconsin 617800
21 Harrisburg Transportation Center Harrisburg Pennsylvania 543423
20 Emeryville Station Emeryville California 583865
22 Lancaster Station Lancaster Pennsylvania 539338
23 Back Bay Boston Massachusetts 479951
24 Bakersfield Bakersfield California 476767
25 North Station Boston Massachusetts 456198

Question: On the list of the busiest Amtrak stations in California, what was the overall rank for the Irvine station when the number of boarding and disembarking was less than 683,626?