We've talked about this one in the past, it keeps coming up in threads about train schedules, but because it's always tagged onto other threads, it seems to get overlooked.
I've had a quick look and can't see a response saying that it has been forwarded to the developers for consideration, so I'm going to give it a thread of it's own so we can talk about it and get some feedback on this topic.
Option to quickly select either only the Cargo or Passenger trains
This would be very helpful, I've been thinking about this conundrum for a while now.
Rather than having two different train lists, how about a simple checkbox with something like "Cargo trains only" or "Passenger trains only"? It could be in the menubar in the trains list for most of the menu options there (Service, Museum, Park, Mechanic, Boost).
Here's a sample I just put together, so you can see what it might look like and how it might work as a solution: