Red Dalek's subordinate

A subordinate Dalek distinguished by its red dome supported "a red Dalek leader" during the conflict against the Space Security Service. It was recorded in the Dalek Combat Training Manual compiled by the Time Lords during the Last Great Time War, the Gallifreyans having done "meticulous research" into Dalek history. (PROSE: Dalek Combat Training Manual)

Characteristics
The subordinate was shaped identically to its contemporaries, the red Dalek leader and the silver Dalek drones, whom were designated by the Time Lords as "Type III" casings. This variant of the Type III casing sported large blue luminosity dischargers and slats but with a larger base unit matching the Dalek Earthforce. (PROSE: Dalek Combat Training Manual)

Other Red Dome Daleks
In the time of the Restoration Empire, the Scientist Dalek of the Dalek Time Squad, had a mostly silver "Type VIII" casing with a red dome as well as slats, weapons platform boxes, and sense globes. (PROSE: The Guide to the Dark Times)

Red Top Daleks

 * Part of the Denys Fisher Doctor Who action figures was a Dalek with friction-drive wheels, which was silver with a red dome, a large blue eyestalk and blue sensor globes.
 * A red domed Dalek is seen in Trapped in the Time Corridor, an illustration for the 30th Anniversary Calendar, appearing alongside the Golden Emperor, the Black Dalek, the Red Dalek, and grey Dalek drones.
 * A red dome was used to distinguish a Time War-era Reconnaissance Dalek model which was featured on the cover of Gallifrey: War Room 1: Allegiance.