This is correct.
There is one more concept being tried by Indian Railways that is of DPWCS
(Distributed Power Wireless Control System)
In this system, the Master Loco will send commands and communicate with Slave Locos via wireless communication system. Radio communication is being tried for the pilot project.
In...
more... this configuration 1Master + 3Slaves is proposed and thus 50*4, upto 200 wagons can be hauled by a single driver sitting in Master Loco.