How do I repair the pickup roller assemby on an 8632 whistle tender? The roller makes uninterrupted contact with the hot rail, making the whistle sound continuously. When pushed into/onto the protruding copper contact, the opposite happens: it remains in that position. Is there a parts diagram or video someone can point me to? Should I just replace the whole assemby?
Many thanks
I've attached two photos. 
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The roller is supposed to make continuous contact with the center rail, that's not what controls the whistle!
Agreed, the fault is the circuit board inside. 2 most common failures, the small capacitor and the transistor. This causes the transistor to fail shorted- and thus the whistle motor stuck on. I just repaired one of these last week.
The small capacitor is a 1uF 50V and the transistor is a common MPSA13.
Lionel is out of stock https://www.lionelsupport.com/...ISTLE-alt-6108633020
And, the fact they are out of stock should be a huge hint- these failed a lot.
One theory of mine is the motor tends to not get lubed and runs dry, thus high current, and thus this little transistor just takes the beating and eventually fails.
Tremendous help; many thanks. Youtube is crowded with repair/restoration videos for postwar tenders--not much help when it comes to a circuit board with transitors and capacitors, obviously. Now, I know how to proceed. Again, thanks to both of you.
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