The last Lincoln used as a Presidential state car is a 1989 Lincoln Town Car commissioned for George H. W. Bush. In line with its 1983 Cadillac Fleetwood Brougham predecessor, the roofline of the Town Car was raised several inches to accommodate for the thickness of bulletproof glass (while preserving outward visibility). To better handle the weight of armor plating and security upgrades, the powertrain was upgraded to that of an F-250 pickup truck, receiving a 7.5L V8 and an E4OD 4-speed automatic transmission. Today, the car is on display at the George Bush Presidential Library in College Station, Texas. Since 1993, the Secret Service has used limousines derived from Cadillac vehicles as a presidential state car.