I have used the search function to try and get an answer to my question which is how do I remove the e unit from this engine so it can be cleaned and repaired? There is something prohibiting the e unit from sliding straight up out of its frame and I can't see what that might be.
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I don't have a 2055 handy to look at. On some of the 6-wheel parallel-plate motors, there's a small self-tapping screw in the side that holds the E-unit to the side plate of the motor. Also, there are wires soldered to the E-unit from the roller pick-ups, etc., which may not have a ton of slack.
If you've already removed that screw and there's any slack in the wires, you might just have to give the E-unit a firm tug. It's a pretty snug fit. Good luck!
It should come out with one screw on the side removed. The unit 100-25 only has one screw. As previously mentioned if you have enough slack in the wires you may just have to give it a firm pull. Maybe even rock it back and forth a little bit to wiggle it out.
Train Nut I have removed the side screw and have plenty of slack in the wiring. Even at that it seems that there is something solid keeping this unit from coming straight out.
Aside from the one screw there should be nothing else holding that in. Unless somebody added a second screw, but that not likely. The screw should be on the brush side of the motor.
If you're trying to pull it straight up maybe try to shove it back a bit and then try to wiggle it up and out. Don't be afraid to carefully put a screwdriver in there between solid points and try to use it for leverage being careful not to pinch any wires or break anything.
Train Nut there is no other screw holding this in. I will have more time in the morning to really attack this very stubborn e unit. I do not want to put any lubricants like WD-40 or similar to help me get this out.
Maybe you could try a pair of snap ring pliers to spread the frame a little. I use them when replacing collector shoe assemblies to spread the frame.
I recently removed the E-unit from the Lionel 2065 baby Hudson which is the sister engine of the 2055. The 2065 has the feed water heater. Other than that they are exactly the same engine. I had to do quite a lot of wiggling to finally remove the unit but eventually it did slide out. Sometimes the wires at the bottom of the unit get pinched in between the E-unit and its frame making it a little difficult to remove but it can be done and there is nothing else holding that unit in place other than the than that one side screw. Be patient with it and keep on wiggling. Good luck.
A 1/32" of wire wedged the e unit to its frame. Patience and perseverance paid off. The e unit was in great shape (being 70 years old!) but some kind of dirty. The 2055 is on the layout now and runs beautifully. A big thank you to all who responded.
Just pulled one from a 2065. Tales a certain amount of wiggling and prying, as it's a snug fit. 
Mitch
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