Legacy is a great control system. Controlling 4 trains at one time, is going to be a bit of juggling regardless what control system you use. Either 4 transformer controls, 4 Lion Chief remotes, or one Legacy remote.
Switching between engines on the Legacy remote is very easy. I press the select button, type in the engine number, and press Engine. The legacy remote allows you to toggle between the last two engines you accessed.
Others have stated how feature rich legacy engines are. You can select various smoke levels for a legacy engine. You can fog out a room or just have wisp or somewhere in-between. Legacy railsounds are incredible. Have a legacy engine going at speed, set the momentum to high and apply the brake. The engine will slow down gradually and you'll hear brake squeal the entire time. And this is just the tip of the iceberg with what you can do.
I have 18 switches on my layout. All switches are setup in my Legacy remote. By pressing one button, the remote will throw a series of switches (a route). I do not have to throw each one separately.
I can also control all my accessories and my transformer with the remote.
If things get out of hand, there is a panic button on the remote which will kill all power and stop everything.
Your entire layout is at your fingertips. Whats not to like?
