user: Question: What is the manufacturer, found under the Built column, that made locomotives with a Fuel/Trans of Diesel-Electric?
Columns: ['Name', 'Built', 'Wheels', 'Fuel/ Trans', 'Status', 'Colour']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Ted', 'Lister 1944', '0-4-0', 'Diesel-Mechanical', 'Under Rebuild', 'Brown']
SQL:

assistant: SELECT "Built" FROM "Table" WHERE "Fuel/ Trans" = 'Diesel-Electric';