Several models of proposed developments were shown at Transpo. These included models of Garrett AiResearch's wheeled linear induction motor (LIM) testbed vehicle, drawings of Grumman Aircraft's and General Electric's TACV proposals, and a full-sized mock-up of a futuristic Rohr design. Three of the four designs eventually won contracts and were built to varying degrees at the TTC; Garrett's wheeled vehicle started testing under jet power before the LIM reaction plate was installed, Grumman's vehicle was given an extensive track, but ran out of funding before the planned LIM reaction plate could be installed, and Rohr's vehicle was the last to arrive and received the least build-out with only a mile and a half of LIM-equipped track. Like the PRT systems, none of the TACV proposals would ever see commercial development.