CREATE TABLE table_55005 ("Year" TEXT, "Make & Model" TEXT, "Length" TEXT, "Engine Type" TEXT, "Numbers" TEXT)

What is the length for a diesel engine with numbers of tbd (13 buses)?
SELECT "Length" FROM table_55005 WHERE "Engine Type" = 'diesel' AND "Numbers" = 'tbd (13 buses)'
SELECT "Length" FROM "table_55005" WHERE "Engine Type" = 'diesel' AND "Numbers" = 'tbd (13 buses)'