None. It is the 1993 Ballard PEM Fuel Cell Phase 1 Prototype
This is the vehicle that introduced the transit world to zero emission fuel cell powered vehicles! In 2024 it was kindly donated to the Transit Museum by Ballard Power Systems. It has been in store in the Fraser Valley but appears to be none the worse for that, save for wanting a good power wash. (TMS member Bobb Williamson obliges.)