CREATE TABLE table_54263 ("Railway" TEXT, "Loco name" TEXT, "Build date" FLOAT, "Wheels" TEXT, "Disposal" TEXT)

Which railway had the earliest build date and a disposal of 'Scrapped 1941?
SELECT MIN("Build date") FROM table_54263 WHERE "Disposal" = 'scrapped 1941'
SELECT MIN("Build date") FROM "table_54263" WHERE "Disposal" = 'scrapped 1941'