search our threadsI am new to trains and I dont know many of the terms and parts. can uy please help
Hehehe, your O scale newbness is showingHere's a wiki:
And here are some photos:
They are among my favorites of all time.
It's the same thing for AF, too. If you'll allow me to tweak it a bit, here's my version. An e-unit has 4 basic components: 1. a coil, 2. A plunger that is moved by the coil, 3. A drum with a patterned copper overlay, and 4. The fingers (2 sets). It works this way. When you turn on the transformer, power flows to the coil (usually mounted in the tender) and the plunger is jerked up and held there. As long as power is not interrupted, nothing happens. However, at some point, you shut off the transformer, derail, or hit a dead point in your track. Once this happens, the power fails and the plunger falls.Hi bigtrucker,
I'm just learning the lingo, too. I think that Lionel made a few version of it's e-units ... a four-position one (fwd / neutral / reverse / neutral ... then repeat), and a two-position one (fwd / reverse ... then repeat). My little #249 loco has the two-position one mounted on the rear of the engine. The e-units usually have a little lever that you can position to engage the e-unit auto-direction ability, or turn that funcion off, if desired. My understanding is the the e-unit solenoid senses a short-duration drop in track voltage ... this pushes the solenoid plunger up/down, which, in turn, mechanically moves a little rotating toggle that flips the direction of the wire leads to change the current direction ... and hence, the train direction. Pretty ingenius thinking for post-war, pre-diode and computer chip technology!