Despite the fact that I woke up this morning to find all of my saves gone, including a sandbox map of Central City where I was at 98% reputation with nearly $10M in cash :angry:, I only have one vehicle to suggest: the overhauled PCC electric tram (Presidential Convention Committee, originally built in 1947, overhauled in 2001):
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NOTE: Earlier machines were created in 1941 but had air brakes instead of electric brakes, plus the 1941 PCCs had NO porthole-like windows above the normal ones.
Hundreds of the electric-braked models were made in 1947 for Philadelphia to match the curvy stylings of the automobiles that were being made during the period, and lasted well into the 1970s before their first overhauls, and a slow replacement of these with Kawasaki "K" cars beginning in 1981 (see below). The city had DOZENS of tram routes, five of them leaving/entering tunnels and running on the city streets, but by 1992 every single trolley route except for the Subway-Surface lines (the streets-city tunnels routes) which used K cars exclusively to this day. In 2001, Philadelphia saved eighteen of the 1947 models from the scrap heap, stripped them and rebuilt them to serve a single route as a heritage line, re-energizing one of the most bleak corridors in the city beginning in 2003.
The ones that Philadelphia didn't want were practically given to San Francisco as a gift for the MUNI line (they were hard to sell off), and dozens were left rusting in the sun until they were wastefully scrapped.
Another suggestion is the 1981 Kawasaki car (known in Philadelphia as the "K car"):
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These replaced the 1941 PCC cars (the ones with the then-faulty air brakes) and are still used today on the Subway-Surface lines. They're also built like tanks - one took a broadside hit from an SUV a few years ago with merely minor scratches!