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
A red-domed silver Dalek supported the black-and-gold Dalek leader who captured various Earth naval vessels and raided Sydney Harbour. (COMIC: *Sub Zero)

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.
 * The King Dalek was a "Red Top" Dalek, based on a modified prop kept by Dalek creator Terry Nation, which appeared in War of the Daleks, where it was supported by Silver Dalek Guards who also sported head sections which were coloured completely red along with their weapons platform "arms".
 * A red-top Dalek with cone-shaped lights like the King Dalek was among the cards released by Weetabix.
 * 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.
 * Character Options' "Dalek security patrol ship" included a bronze-type Dalek pilot coloured predominantly black with a red dome and silver slats and sense globes.
 * 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.