Abbreviation of a journal name How do I find abbreviation of the journal name Engineering?
How to find journal title abbreviations? (in general)
There are various sources of abbreviated journal titles, and though most of the time they agree, there are definitely cases where they do not. So:

Check the citation style of the journal you're writing for (if any). They may specify an authority on abbreviations, or specify that journal names are not to be abbreviated.
For example, the American Chemical Society style guide says to “abbreviate the name according to the Chemical Abstracts Service Source Index (CASSI)”. Chicago style forbids abbreviations.

Then, see if the journal you're looking for is included in the authoritative list.

If it's not covered, then then the best source for information is the cited journal itself! How do they abbreviate their own name, e.g. on article page headers/footers, or in citation to articles from their own journal?

An alternative is to look into one of the very large citation indexes, such as Web of Science; they maintain a list of journal abbreviations for the journals they index.



What about Engineering?
Well, that's not an easy case. First, it's a very low-profile journal: despite its claims that it is “indexed by several world class databases”, I don't think it is. Let's take ISI Web of Knowledge, which they cite as their first example. It indeed has a journal named Engineering – London in its index, but a quick search reveals it is another journal entirely, published between 1969 and 1994. Moreover, the citations given as justification in a screenshot by the publisher of the modern-time Engineering cannot be found on the journal.
So, the journal is not present in the ISI index, and does not given information about how to abbreviate its name (it does not use journal abbreviations in its succinct style guide). In other engineering journals, the word Engineering is usually abbreviated as Eng. So, either go with that, or use the full name and let the copyeditor worry about it.