I did not know that routemasters run on rail replacement duty until only a few weeks ago! The routemaster that I got onto was LTZ1343 and is one of a few to actually have the engine FULLY shut down, but as you can see in the video below, the engine was triggered on perhaps by the increasing speed of the bus! Lovely smooth ride by Arriva.
https://youtu.be/ijfC1IhtQaI
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https://youtu.be/ijfC1IhtQaI
Sent from my SM-J500FN using Tapatalk