The other day I posted about freight cars both real and model that have a slight lean to them while sitting or moving on a level track. During a brief scout of photos and videos, looking for examples, I saw this instead:

https://www.youtube.com/watch?v=5sVbCRLEZCE

Traveling Tom's video shows a couple of gondolas with some unusual action to the trucks called hunting oscillation. I wasn't familiar with the term and I don't think I've personally witnessed a real life occurrence.

I found this modern pic of a bridge with guard rails,

but don't know how they should be placed on my 50's bridge.

Help, DCC Control Center (3 decks, multiple districts)

I have a wireless NCE Pro system I intend to install on my double deck HO layout. I don't imagine I will be running any more than 4-5 trains at anyone time, and likely it will only be 2 most of the time. There will likely be some double-headers, or even some push-pull.

With a 5amp power supply most recommended by NCE I don't think I will need additional boosters?

I'm beginning to make some structures for my layout and finding many of my kits have poor model roofs. Feeling that roofs are so visible and thus important, I intend to replace with sealed seam metal roof and asphalt roof sheets from Evergreen, Micromark, respectively.

Question though: How do you experienced modelers solve for the roofcaps necessary on these roofs, how do you fabricate the roofcaps and what strip styrene do you use? (I'm modeling in styrene, not wood).