The Padre

Hi, I was wondering if someone could please help me, I am fairly new to this, but have a server set up for my kids and some friends, just updated to Tekkit Lite 0.6.1 and I have lost all of my electric engines that I have been using. My question is have they been taken out of the game, do I need a plug in? I am lost and out of my depths and would really appreciate some help. Thanks in advance for your time in answering.