One of the New York Central Systems/Pittsburgh & Lake Erie A-2 Berkshires. Ten of these Berkshires were ordered from Alco by NYC chief mechanical engineer Paul Kiefer in 1948, and there is a definite familial resemblance between the A-2s and the S-1b Niagaras and, to a lesser degree, some of the late J-3a Hudsons and the L-4a/b Mohawks. There was apparently a lack of communication between management and Kiefer, because the NYC was already on its way to dieselization, and when they found out that Kiefer had just ordered ten new brand-new steam locomotives, they tried to cancel the order. But Alco had already begun construction on them, and so they refused to cancel the order, because they would be stuck with locomotives that would likely be difficult to sell. Since they had only begun construction seven of the ten, they did reduce the order down to seven. Also interesting was that by this point, Alco had already converted their tender shop over to diesel construction and so they actually had to sublet out construction of the tenders to Lima, who was still all-in on steam locomotives.
NYC had no desire to really take ownership of these locomotives for their main system, and so they decided to foist them off on the Pittsburgh & Lake Erie. The P&LE wanted to purchase diesels, and was not particularly pleased at these orphan locomotives getting tossed at them instead. The A-2as as they were classed, were also rather antiquated machines even when new. They had 63" drivers, long after it had been realized that 69"/70" drivers were the best choice for Berkshires, they had friction bearings, no feedwater heater, no trailing truck booster, and they had smaller cylinders and a lower boiler pressure (and resultantly, less tractive effort) than the Boston & Albany A-1a Berkshires of over 2 decades earlier. The only concession to modern construction that they had were overfire jets, an appliance of dubious usefulness. I have to wonder if these were supposed to have 69" drivers and all the modern appliances, and New York Central nixed all that to save costs on locomotives that they didn't even want in the first place. One oddity was that they were delivered in olive grain paint on the boilers, cabs, and running gear.
The P&LE put them in service, where they toiled in relative obscurity, and started putting them into storage as early as 1952, at just 4 years of age, as diesels started filtering onto the property. They would see a brief revival in 1956, when casualties of deferred maintenance on steam locomotives began wiping out the remaining Mohawks, Mikados, and Niagaras that were still running on the "Big Four Route" and caused a power shortage. The A-2as were put shipped west to Ohio and reactivated but that was a short-lived reprieve. Almost immediately they began having their own issues, caused by poor maintenance and years of storage, and their availability was very poor. The shortest-lived of them ran for 20 days before being knocked out of service, while the longest-lived ran for only 100 days in this service. They were plagued with issues of scored axle bearings and leaky flues and superheater elements. By 1956, scrapping had begun, and by 1957, they were all gone, making Alco the only American manufacturer whose last-built steam locomotive no longer exists.