I don't know where people get their information from? But none of the bars in the "Zona Norte" have trannies. ( not even Kinkle which is a Mexican local bar now)
There use to be trannies in some of the Revolution bars, and there still is in places like Temptations and perhaps Peanuts & Beer, but most of the other places have closed down. But if you see a tranny it's pretty easy to spot.( but they use to fool hapless gringos all the time on REVO who couldn't figure it out or didn't want to figure it out)
You will often hear stories about some tranny supposedly working in places like AB or HK, but they never give you a name, and if you follow the story it's usually some jealous BG spreading the rumor because she saw her favorite customer looking at another girl. But not one of those rumors have ever panned out.
You'll also hear largely a myth about trannies working in bars with man-made pussies. The thing is it's not true. There are transsexuals out their with man made pussies, but they usually aren't sex workers.
Sex workers who work as prostitutes and porn stars 95 percent of the time have DICKS. There is almost no market for for transsexuals with no dicks, except maybe in high end modeling.
And you don't have to go with trannies to know this is true. Do an internet search on shemales, ladyboys, trannies. You probably couldn't find one picture without a dick. Do a search on Craig's list in any major city and put in "ST" and you see noting but ads with trannies and their big surprise.
Oh another thing the guys that seek out these type of girls don't consider themselves gay or even bi for the most part. Now that's not to say other might consider them gay or bi. True gay dudes or even bi guys who are looking for other dudes don't seek out trannies, because if they want a guy then they seek out guys looking like guys.