CREATE TABLE table_51811 ("Name" TEXT, "Built" TEXT, "Wheels" TEXT, "Fuel/ Trans" TEXT, "Status" TEXT, "Colour" TEXT)

What is the color of the locomotive built by Minirail 1954?
SELECT "Colour" FROM table_51811 WHERE "Built" = 'minirail 1954'
SELECT "Colour" FROM "table_51811" WHERE "Built" = 'minirail 1954'