Being a girl in an engineering department is GREAT! Everyone knows your name, the students, the lecturers, the admin staff. Everyone. If you're a girl, you'll be a somebody, rather than a nobody. This is especially true at first. By the time you reach the third year most of the lecturers will know the blokes too, but as a girl, you'll be recognized straight away.
However, word of warning girls. You may become influenced by the men. I got a little worried, when after 6 months, one of the guys farted in labs and TO MY HORROR... i laughed. It was the beginning of the end for me. I had passed to the dark side.
On the plus side, i'm completely comfortable in any mans company now - i went to an all girls high school, so it was a bit of a shock walking in on the first day! But now, i think i prefer male company to females. Plus, when you become close friends with them, they start looking out for you and looking after you. All protective and that. It's quite lovely. Although, you will probably be the butt of many jokes and get teased, but it's all in the name of fun.
Anyways, it's ace and can be used to your advantage. I had some major problems at home in first year, and i was struggling to finish an important piece of coursework as a result. Went to see my supervisor and broke down in tears. He didn't know how to handle a crying girl, so gave me everything i asked for (extra tuition and a ridiculously long extension).
So yes girlies. Study engineering. Look pretty. And make those guys swoon.
The only bad thing... i started getting a little lazy about my appearance in lectures fairly quickly - cos all the guys were mates... you know, hoodies and jeans every day, tied back hair, very little make up (if any). Then, in final year, i got close to a guy i hadn't spent a lot of time with before... and developed a major crush on him. So, i started making an effort with my appearance for lectures and the like. At which point EVERYONE realised i had a crush on someone (thankfully they never found out who) but i was the joke for a long time... All worked out pretty well cos it turns out that guy liked me too and we had a brief secret fling before uni ended.
Anyways, i've written an essay... Go forth and prosper girlies.