Table: railroad_vehicles_4
Columns: number
builder
type
date
works_number

Question: What is Type, when Works Number is 75823?
SQL: SELECT "type" FROM railroad_vehicles_4 WHERE "works_number" = '75823'

Question: What is Date, when Type is DS4-4-750, and when Works Number is 74409?
SQL: SELECT "date" FROM railroad_vehicles_4 WHERE "type" = 'ds4-4-750' AND "works_number" = '74409'

Question: What is Works Number, when Type is RS-11, and when Number is 61?
SQL: SELECT "works_number" FROM railroad_vehicles_4 WHERE "type" = 'rs-11' AND "number" = '61'

Question: What is Builder, when Date is 1925?
SQL: SELECT "builder" FROM railroad_vehicles_4 WHERE "date" = '1925'

Question: What is Works Number, when Number is 55?
SQL: SELECT "works_number" FROM railroad_vehicles_4 WHERE "number" = '55'

Question: What is Builder, when Date is 1953?
SQL: SELECT "builder" FROM railroad_vehicles_4 WHERE "date" = '1953'