@Mosin posted:
...I would really like to put an e-unit into it so I can put it in reverse. Alternatively if possible, I would like a source for control / e-unit / sound cards that I could install.
If options are what you're after, MTH LocoSound steam boards came out in the PS2 timeframe and is essentially an E-unit with rudimentary sounds (NO DCS command capability). An OGR search will no doubt show many threads about upgrading LocoSound to PS2 or PS3; the point being the displaced LocoSound boards are probably sitting in a box and perhaps can be had for little cost.
I'm pretty sure the LocoSound board had the electronics to control smoke so that would be a consideration if comparing to a E-unit from another vendor.