>>1027125The Borismaster has a tiny 4.5l engine which runs only to generate current and charge batteries. The drive system is electric motors. This is incredibly efficient. Furthermore, there are full battery buses in operation and more hybrid versions. All are less smelly and less noisy than the old buses, when I see an old ALX400 these days it is deafening and smelly.
Old ALX400:
https://www.youtube.com/watch?v=CxJxWdIp4jENew Evoseti:
https://www.youtube.com/watch?v=A2pfZIXW6hg