Show different builders of railways, along with the corresponding number of railways using each builder.
SELECT Builder ,  COUNT(*) FROM railway GROUP BY Builder
SELECT Builder ,  COUNT(*) FROM railway GROUP BY Builder
[{'Builder': 'Avonside', 'COUNT(*)': 1}, {'Builder': 'GER Hartford', 'COUNT(*)': 1}, {'Builder': 'GER Stratford', 'COUNT(*)': 1}, {'Builder': 'GNR Doncaster', 'COUNT(*)': 1}, {'Builder': 'GWR Swindon', 'COUNT(*)': 2}, {'Builder': 'MR Derby', 'COUNT(*)': 1}, {'Builder': 'SECR Ashford', 'COUNT(*)': 1}, {'Builder': 'Stephenson', 'COUNT(*)': 1}, {'Builder': 'Swindon Works', 'COUNT(*)': 1}]