Which Fleet Series (Quantity) has an Order Year of 2010, and a Model of de40lfr?
CREATE TABLE "current_fleet_roster" (
  "builder" text,
  "model" text,
  "length_ft_m" text,
  "order_year" text,
  "fuel_propulsion" text,
  "fleet_series_quantity" text
);
SELECT "fleet_series_quantity" FROM "current_fleet_roster" WHERE "order_year"='2010' AND "model"='de40lfr';