As you can see in the image of the time train below, there are three letters: "ELB". Now, it stands to reason that these are probably Doc Brown's initials i.e. Emmett Brown. This indicates, though, that Doc has a middle name starting with 'L'. What is Doc's middle name?

Time Train

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    The train is not the only place his middle name initial is mentioned. In the cave where he hid the DeLorean he had carved his initials ELB into a plank of wood. The letter Doc sent to Marty was signed Your friend in time, "Doc" Emmett L. Brown - just to name a few examples. – Lars Ebert Aug 20 '15 at 9:43
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    @larsebert this letter: bttfstore.com/bttf3_letter_from_doc3.jpg – AncientSwordRage Dec 28 '15 at 10:45


The Back to the Future Wiki page on Doc cites the episode Put on Your Thinking Caps, Kids! It's Time for Mr. Wisdom! as saying the following:

In the episode, Mr. Wisdom refers to "Emmett Lathrop Brown". Marty replies "Lathrop? So that's what the "L" stands for!"

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