What's the difference between common rail and mechanical injection diesels?

Diesel engines rely on different types of fuel injection. Mechanical was used early on, but common rail became more popular ...
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5 Ways to Ensure a Common-Rail Fuel System’s Longevity

"Common rail." It is a term that at this point is universally known across the entire diesel space. However, for uninitiated or new enthusiasts, the term refers to the manner in which late-model/newer ...