bogies" which offer increased adhesion and better ride quality. While it retains the basic SD70 designation, the locomotive has several major new features that set it apart from its successful ancestor such as a vibration-isolated powertrain, and alternator start capability. In addition, it features a newly redesigned cab reminiscent of the earlier SD70M, featuring the classic "teardrop" windshields first introduced on the FP45 in December 1967; new fabricated trucks; a longer frame at ; longer radiators with three radiator fans instead of two; an additional step on the front and rear; and a smoother long hood roofline. Fifteen SD70ACe-T4 demonstrators were built at Muncie, Indiana by November 2016. Union Pacific was the first customer to order SD70ACe-T4's. UP 3012–3014, the first production SD70ACe-T4's, were assigned to active service in early November 2016. Union Pacific will acquire 100 SD70ACe-T4's: 12 former demonstrators will be rostered as UP 3000–3011, and 88 production units (3012-3099). 3012-3056 were built at Bombardier's Sahagun, Mexico plant. 3057-3099 will be built at Muncie, IN, following completion of the Tier 4 credit SD70ACe's UP 8997–9096. All UP SD70ACe-T4's are classified as SD70AHs. SD70ACeP4-T4's EMDX 1603 and 1604 were built and painted as demonstrators for the BNSF. These units have a B1-1B wheel arrangement akin to the SD70ACe-P4. In August 2018, CSX Transportation ordered 10 SD70ACe-T4's, of which all have now been delivered. They are classified by CSX as ST70AH. Norfolk Southern originally ordered 10 SD70ACe-T4's, but opted for more SD70ACe Tier-4 credit locomotives instead. The cancelled units are currently part of the Progress Rail lease fleet. EMDX 1501 will remain in Progress Rail Services ownership as a test bed. SD70ACe/LCi (2005-present) The SD70ACe/LCi is a low clearance, export version of the SD70ACe. The LCi in the model designation stands for Low Clearance international as these locomotives are designed to negotiate the tight clearances under the mine equipment. External differences between the SD70ACe and SD70ACe/LCi models include the addition of marker lights, number boards located lower on the nose rather than on top of the cab, windscreen protector panels (to deflect abrasive iron ore when in mid train position), fire suppression canisters, louvre style vents, different horn and subtle differences with handrails. In 2004, BHP Billiton ordered 14 SD70ACe/LCi locomotives for use on iron ore trains in the Pilbara region of Western Australia. The first member of the class (4300) was purchased for parts and dismantled upon arrival in