They probably are not standard fluorescents, but induction lamps like this:
The tube is filled with similar inert gases and phosphor coating that give off fluorescent glow, but there are no wires or starter mechanisms whatsoever inside the tube. Those metal or plastic rings around the tube excite the gas wirelessly with radio waves. They last 10 years, same as LEDs' rated lifespan, and can come in long-tube form as well as circular. Electrodes are what cause standard fluorescent tubes and CFL's to buzz and flicker, cause them to go dim or glitchy when they fail, and eventually crap out altogether. Eliminate the electrode, eliminate the limit on lifespan and all the unreliabilities that cause them to malfunction.
The T uses these all over the system for retrofits of existing fixtures and some types of new installations. They're preferable to LED's in some situations where very high-intensity light has to be spread in uniform direction from a single source (like those standard bell-shaped fixtures in lots of stations), something LED's are not always ideal at doing because they're dot matrix arrays on a silicon wafer shining strictly unidirectionally instead of all over. And unlike LED's they use standard replaceable bulbs; on an LED fixture the custom wafers may be hard-wired into the fixture and non-replaceable, or only replaceable for as long as the fixture manufacturer cares to keep that particular custom wafer in-stock. So when they do fail, induction is just a 2-minute bulb swap while some LED fixtures have to be wholesale-replaced for lack of any repair options.
It's not so simplistic like "if it isn't LED it's wasting energy". LED's aren't perfect for every type of light profile; induction lamps are sort of the default #2 choice now for the LEED-certification lighting toolbox. The T uses them as significant minority of its lighting retrofits. Porter headhouse, for example, first got them on its bell-shaped fixtures almost 6 years ago.
