-- Database schema
| railway : Railway_ID [ INT ] primary_key , Railway [ TEXT ] , Builder [ TEXT ] , Built [ TEXT ] , Wheels [ TEXT ] , Location [ TEXT ] , ObjectNumber [ TEXT ] | train : Train_ID [ INT ] primary_key , Train_Num [ TEXT ] , Name [ TEXT ] , From [ TEXT ] , Arrival [ TEXT ] , Railway_ID [ INT ] train.Railway_ID = railway.Railway_ID | manager : Manager_ID [ INT ] primary_key , Name [ TEXT ] , Country [ TEXT ] , Working_year_starts [ TEXT ] , Age [ INT ] , Level [ INT ] | railway_manage : Railway_ID [ INT ] primary_key railway_manage.Railway_ID = railway.Railway_ID , Manager_ID [ INT ] railway_manage.Manager_ID = manager.Manager_ID , From_Year [ TEXT ] |
-- -- How many railways are there?

SELECT count(*) FROM railway;