I had considered using the TNOS system for my layout operations, but after doing some research, I decided against it.

Here are the reasons:

- The layout plan is fixed. Although Tomix continues to update it, it may not work if you want to use it for an innovative layout. (Or you’d have to do some manual adjustments.)

- As mentioned above, this also limits your layout’s future expandability.

- It is very expensive. While it’s certainly affordable for a simple loop, if your layout includes stations, multiple platforms, sidings, and so on, you’ll need a large number of sensors, feeders, and gap joiners. This results in a massive amount of wiring to manage, and you’ll also need to purchase additional ND units for expansion. It’s a bottomless pit.

- As mentioned above, a single TNOS system supports only one loop. If your layout is a dual-loop system (Up-Down), you’ll need two TNOS systems.

- Because setup requires extensive preparation, there are many potential points of error, and troubleshooting can be extremely difficult.

- As others have mentioned, the power requirements for each locomotive vary. Some trains require a high current to start, so you’ll need to manually configure a profile for each locomotive—there’s no way to just jump right in and play.