The figures in the foregound make the ship look about 20 feet tall.
   
 

Since the Pennsylvania is described as new, we can date this booklet to the early 30s; that ship hit the brine in 1929. It carried about 540 passengers, so I assume about the same for the California. OTOH, the Cali's troop-transport capability was 4500. They must have really packed them in.