The GRT fleet consists entirely of motor buses. Kitchener Transit operated trolleybuses earlier in its history, but they were withdrawn from service during the 1970s, well before the systems were merged. GRT continued operating 23 compressed natural gas-driven buses inherited from Kitchener Transit but did not expand this fleet; these buses were retired before the end of 2009. Until the 1950s, the area was served by electric passenger and freight trains run by the Grand River Railway, which even earlier in the 20th century had run streetcars on city streets before the separated railway lines were built.