CREATE TABLE table_name_47 (railway_number_s_ VARCHAR, year_s__of_manufacture VARCHAR)

What are the railway number(s) for year(s) of manufacture of 1905 1906?
SELECT railway_number_s_ FROM table_name_47 WHERE year_s__of_manufacture = "1905–1906"
SELECT "railway_number_s_" FROM "table_name_47" WHERE "1905–1906" = "year_s__of_manufacture"