It's an orphan within the Toronto subway system. That's bad because it increases costs - parts, facilities, maintenance, and so on are a lot more expensive when you can't buy them en masse. Look at the bus system as an example. There are only two buses used - the Orion VII and the NovaBus LFS. There are minor variations within the fleet but the platforms are all one or the other, and each garage only handles a few different buses rather than an assortment of the fleet. Now imagine if the TTC bought 28 VanHool buses from Belgium, and built an entire garage just to service that 1% of the bus fleet. It would be way more expensive on a per-bus basis to service those, since they need unique parts, segregated facilities and unique knowledge from staff. This is also why every TTC subway car has been built by the same company (Hawker Siddeley became UTDC, which became Bombardier Transportation) for more than 50 years.
Only after the Eglinton subway is called the "Miller Express" and one of the stops is named after the shortest political campaign ever.
