The diode-like piece is likely a TVS, Trainsient Voltage Suppressor. "A spike sponge" like surge protection power strips. (you shoud use one w/breaker ideally) It helps protect electronics from wild voltage spikes from derailments, static, home ac spikes, etc.. more are better. (it takes a split second for voltage to stabilize when there is arching this catches excess.
Most bulbs have numbers SOMEWHERE on the bulb or bulb base. A bulb number. voltage, watts &/or amps. Count all the watts or amps, do the conversion math to get one number in Amp. or Wtt. Now compare that to the power supply -5-10% for continuous adding, waiting, checking for tranformer heat.(1033 90w 5-6amp). If you only have a number, search it with "miniature bulb or lamp. The numbers fit a standard 99% of the time.
GG doesn't have to keep the outside rails apart unless you need it for your design. Where the can be jumped together, they should be. Yes the switches will tie the outer rails. If you don't like it, skip the pin , aline/shim &fasten track & switch firmly to the layout.
Or move the gap further the other end of the rail and that could extend anti derail length.
If I repeat myself, it's because all the posts haven't been loading to review on.
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