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Speaking of Mexico City, trolleybuses there have a doubtful future. As of now, the trolleybus fleet consists mainly of two batches, one from the mid to late 90's, and one from the 80's (some from around 83-84, others from around 87-88). Plus a handful of units from 1975 which are still in regular service.
In the last couple of years on one hand there has been no effort to renew trolleybuses, and financing for the STE (Servicio de Transportes Eléctricos, public enterprise operating trolleys and the Xochimilco light rail) has been continually reduced, in a likely effort to eventually close it down or privatize it. Meanwhile a lot of investment has gone to the clunky Metrobús BRT system, to the point where one single Metrobús line gets about 90% as much financing as the whole STE. If the STE isn't kill yet it is thanks to its powerful union, which dates back to the streetcar days.
On the other hand, some time ago some trolleybus lines where converted into sort of quasi-BRT called "Corredor Cero Emisiones", where a bus lane was drawn and physically separated (with little bumps on the street), and trolleybus stops were refurbished. This was ofc a bare-bones improvement, and this was hence dubbed "Corredor Cero Inversiones" (zero investment corridor). Despite that, these corridors work pretty well, they offer rather good frequency, and manage to mostly avoid traffic jams. The newer buses from the 90s are used on these lines.
As of now, there are 3 Corredor Cero Emisiones lines, and 5 conventional lines. Single rides cost 4 pesos (.21 usd) on the CCE, 2 pesos (.10 usd) on the regular lines, this is the absolutely cheapest fare in all of Mexico City, together with the public buses (NOT the private micros), since the subway fare was raised to 3 pesos.
Pic related shows trolleybus lines and light rail line (TL). Lines A, D, and S are CCE. Line K was cut back recently on the eastern side, because the new metro line overlapped, so in this case it was a reasonable measure.