The second number (half the top) is for (1) bonds, (2) 20% certificates of a regional railroad that has a 40-20-20-20 split, or (3) 10% certificates of a public railroad.
The third number (~1/3 the top) is for the 25% certificate of the Lake Superior & Ishpeming, which has a 75%-25% split.
This allows different companies to have different numbers of stock certificates.