Is it broken?
You can also replace the relais by a Delta 66032 decoder and set all the switches to "off".

This module was used in the 33xx series.

Some info (in German) here:
http://hgh-esn.ath.cx/p03_maeana_v-um.htm

As I deduct from the diagram, the module rectifies the AC input to DC, and a zener diode compares the voltage: if below 22-24V, current goes through the large transistor to the motor; if 24V, the transistor is off, and current goes to the reversing relais for a limited (1 sec) period.
Thus, it prevents the jumps older locos make when 24V simultaneously feeds the motor.
In addition, it provides direction-dependent lights (which requires additional diodes in the black leads to the motor).

Thank you, Bart. This is just what I needed to satisfy my curiosity as how this gadget works. I knew that in this forum someone had the answer; this is what makes this forum unique. As far as converting the analog engines, John, I will give it a second thought. The engine I was working to change is a beautiful 3058 which was giving me trouble at any reversing action. Now it is working perfectly with The EM relay, after thoroughly cleaning the relay contacts. How is that the "Vorschaltelektronik" eventually smokes in all the engines John[:(]? I have two 33xx series engines with factory equipped electronic relay and they always work flawlessly and smoothly, without any jerks or hum. This was my motivation to initiate the changes. One only has to be careful to isolate the EM relay from the frame engine.
BTW, in another topic of the forum, someone was having trouble with the engine lights staying on after a reversing action and the engine stalled. I could bet [}:)] that dirty relay contacts is the problem, even a small dark speckle in any contact is enough to cause this symptom of lights on and motor stalled. The contact dirt has enough resistance in the motor circuit path to prevent any current flow[xx(] while the lamps receive the full voltage of the trafo setting.

Roberto, check out the Downloads section of www.toottoot.co.nz

Dion, the owner of the site knew you wanted this, so specially made it for you.....

Bart, I think Dion has created this diagram by reverse engineering the circuit. As he says on his web page "this circuit has not been checked by anybody else, so something could be wrong!". You can email Dion if you wish, links are on the web site home page.

You're right, Bart ...
Remember when that very first ERS went up in blue smoke ? (my E254 Gator #3335)
And it was our great Electronic Guru Jorge , then, who told me they're just junk, and never last.
And I better go UB#76200 in the future. He was soooo right - four others were down the river, soon.
Well, installed that UB in many locos, meanwhile. Still happy with his excellent advice

Never touched 'em, Bart - all wired OEM. They simply couldn't stand regular use ... [xx(]