In response to the V-car's poor acceptance, UTL asked John Van Dyke to design a tank car along more conventional lines. This car, later known as the X-car, was patented August 30, 1904 (US 768888).
Following the poor reception of the V-car, UTL commissioned John Van Dyke to create a tank car with a more conventional layout. The resulting vehicle, known as the X-car, received patent protection on August 30, 1904 (US 768888).