Well, we ran my Legacy system along with the Cab1L at the Great Train Expo in Anaheim, CA this past weekend. I prefer my Cab2 but it did get the other group members of the All Aboard Fastrackers with 54 square modules set up to use the mainline with the Cab1L and at least get used to remote use. Everyone else but me really liked the Cab1L and gravitated towards it. The Cab1L was really their preference. Before this no one would even use the Cab2 to run trains so I have moved them a step forward.
Now we did run a couple of Legacy engines with my SP GP35 getting some run time but the speed steps did not communicate between the 2 remotes so if I would go to dial in a different speed on the Cab2 and someone was running it with the Cab1L the speed would change to the Cab2 speed and vice versa. Not a big deal but interesting. Of note was using the Legacy system I have set mine to channel 7 to prevent different groups from cross talking in a show and this was very easy to program on the Cab1L.
I did also upgrade to other Legacy remotes and bases for another groups members to 1.52 so I did my public service good deed for Lionel. Now I just have to find a good flowchart that describes the Legacy system, power masters, TPCs, and transformers since I got a lot of questions.