I have several Railking steamers that I have removed the ps2 electronics from, and used them in other engines. I would like to make these run again if I could. I was wondering, what kind of rectifier would I need to do that? I only need forward only operation, to keep things simple. I know very little about rectifiers, so I need advice..........any replies are appreciated.
Barry
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Seeing as you have "several" to convert here are some 8 Amp bridges for 30 cents a piece (free shipping from Asia).
Thanks for the reply, I appreciate it.
BTW, you may recall that your PS2 boards had a similar style/package of bridge rectifier...and that was mounted to a heatsink - piece of folded sheet aluminum as I recall. I can't imagine you pulling 8A with a RK O-gauge steamer but even if averaging just a few Amps it is prudent to mount the bridge to a piece of scrap aluminum...that mounting hole is there for a reason! 
Here's what may even be that same type rectifier in the eBay listing mounted to sheet aluminum for heatsinking; # 4-40 machine screws fit perfectly...
A layer of thermally conductive compound to increase the speed of heat transfer should go between the BR & heat sink too. (look close, see the white layer where the two meet?)
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