I was able to fix up a stanchion that was broken off from the part that was bent up, I think it developed a stress crack when I was taking the shell on and off. Turns out you can generally solder any metal handrails that were broken off, so long as solder sticks to them.
I previously broke off the handrails on accident on my Lionel UP ES44, the double height ones on top of the AC cabinet. I was able to repair the damaged railings by extracting the broken off pieces from the shell and soldering them back on, they took the solder very well (my guess is they're made from stamped tin) and are very strong. I have attached some pictures below to show the fix on that, if you look closely you will see the solder on the repaired areas
I did this same fix for the stanchion on the Atlas Dash 8 and it too is a very strong fix, a bit of silver touch up paint makes the repair unnoticeable. Below is a picture of the repair I just did, the one on the right has the repair
