US Patent 7513321 Two cars in tandem

Two cars in tandem consist of a small front cab car and a second caboose car that plugs into the small car resulting in a larger car for more passengers or cargo space. The front car includes a longitudinal support frame that supports the cab. The support frame is angled downward from front to back relative to the ground so that a forward end of the frame is higher than the back end of the support frame when the cab is operating in a stand along mode. During coupling, the back end be raised up to be parallel to the ground to provide a proper alignment to receive a telescopic entry of the caboose's longitudinal support frame and thereby hold the rear wheels of the cab up elevated off of the ground completing a connection for operation.