History Main / IdenticalTwinIDTag

** Bert has stubble, while his twin brother 'Arry does not.
** The Brendham Bay Twins and Scottish Twins both wear actual name tags. In the case of the Scottish Twins, the names are painted on because they pulled one too many {{twin switch}}es in their backstory.
** Bill and Ben looking nearly identical to each other was played with in the Season 2 episode, "The Diseasel", in which their drivers removed their name tags so they could play a trick on [=BoCo=], who had mistakenly taken their freight cars. In the Season 17 episode, "Bill or Ben?", Sir Topham Hatt sent Bill to the Steamworks to get a blue coat of paint so Connor would be able to tell him and Ben apart after they played a trick on him. This plan didn't work because Ben tricked Kevin into thinking he was Bill and giving him a blue coat of paint as well.
** Twins Bash and Dash of Misty Island from the Nitrogen Era; Bash has a yellow cab and dome, and black boiler, wheels, and trimming, while Dash has the opposite. Also, Dash has freckles on his cheeks, while Bash does not. This is not the only time a similar formula has been used, as Splatter and Dodge from ''WesternAnimation/ThomasAndTheMagicRailroad'' also use color as a differentiator; The only thing aside from painted-on nametags separating the pair is that Splatter has purple highlights, while Dodge uses olive green.
** Thomas's coaches, Annie and Clarabel, are not ''that'' identical; Clarabel is a brake coach, which means she has a guard's compartment unlike Annie, and her nose is broader and her eyes further apart. Additionally, both twins have their names painted on their sides, while the reboot gives them different eye colors (and replaces their nametags with ornate crests) and gives Clarabel freckles. Annie usually faces Thomas while Clarabel faces backward, though for most of their merchandise facial expressions are used in addition to the other tags; Annie is usually depicted as surprised, while Clarabel is often seen with a smile.

* While the sextuplets of ''Manga/OsomatsuKun'' were identical in terms of both [[AlwaysIdenticalTwins appearance]] and [[BrattyHalfPint personality]] (though they were color-coded on the covers in the tankoubon rereleases), the 2015 revival series, ''Anime/OsomatsuSan'', tosses in [[ColorCodedCharacters color-coded outfits]] and a few unique characteristics to let the viewers separate each brother from the primary Osomatsu -- [[CasanovaWannabe Karamatsu]] has thick eyebrows, [[PerpetualFrowner Ichimatsu]] has messy hair, half-closed eyes, and a tendency to wear surgical masks, [[{{Keet}} Jyuushimatsu]] is always smiling and has large pupils, [[TheDandy Todomatsu]] has a CatSmile and shinier eyes, and [[OnlySaneMan Choromatsu]] has smaller pupils and doesn't have an IdiotHair like the others do. In the movie, their 18-year-old selves are similarly distinguished: Karamatsu has freckle-like acne, Choromatsu wears glasses, Ichimatsu's hair is less neat, Jyushimatsu is an angry PerpetualFrowner, and Todomatsu wears clothes that are too big for him.

** There's also the Tweevil twins Kirstee and Kaycee. The one way to tell the two apart is Kaycee wears a bow in her hair, while Kirstie does not.

* Lola and Lana Loud of ''Franchise/TheLoudHouse'' are PolarOppositeTwins. Lola is the beauty queen of the family, sporting pink pageant gowns daily and cares about a clean and fashionable appearance while Lana is ThePigPen who doesn't mind getting dirty, always seen wearing overalls and a red hat daily, but this doesn't mean they can't pull a TwinSwitch on one occasion or another.

* In the ''Series/LawAndOrderSpecialVictimsUnit'' episode "Double Strands", a serial rapist tries to pin his crimes on his twin brother. The twin, not knowing that he had any siblings, protests his innocence, even against DNA evidence. The real culprit is eventually identified by his chipped tooth and a scar on his stomach.

** This was also used in the [[Series/LawAndOrder original series]] when an ex-con was the prime suspect in a murder until they found out he had a twin brother. A witness, who happened to be a nurse, was able to determine the difference between the two, however, noticing the ex-con had several signs of being a long-time hard drinker, which the other brother did not.