Dave
I THINK I've seen the photo you're referring to, but I can't find it on the web-site mentioned here. There is a photo of a gas-producing trailer in London service and an Eastern National 'something' with a gas produce in the REAR of the bus, but no Cumberland bus.
The photo that I recall simply showed a rear view of the trailer and bus, so I don't know what the vehicle was. I do remember that the gas bag on the top of the bus was enclosed by something solid, presumably to prevent the bag being ripped open by overhanging trees.
John
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