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Does a 2 (or more) cylinder hot-bulb diesel have to have a separate "bulb" for each cylinder, or can they share a preheater/vaporizer? Probably a bonehead question but I cannot see a reason why they can't share. Someone fancy explaining why?

Hi. Newbie alert! As the handle probably gives away, I fix trains for a living. I also have an unhealthy addiction to playing with machine tools, new and old. I've recently developed an interest in model engines, with a view to eventually building a real diesel-electric model locomotive. Then...