It appears that you can have two mobile devices connected at the same time to Explorer. Each device acts independent of the other so you need to set the max speed for each train on each device. If you want to run one train exclusively on one device and the second train on the second device there appears to be no problems. That way there is no "remote fight" with the grandkids. If you want to control both trains from both devices things are somewhat awkward since one device doesn't seem to know what the other device is doing. For example, if you activate the bell on train 1 using device 1 and then want to turn the bell off on that train using device 2, you have to toggle the bell on and then off using device 2. Forward/reverse toggling has the same issue. Horn isn't a problem. So each device will run each of the trains independent of the settings on the other device. So, if one person is controlling two trains it is easier to just use one device. If you want 2 people to each run a train using 2 devices and 1 Explorer, that appears to work fine especially if the two people aren't going to try to operate the other person's train.
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