As it is universally known, the Pennsylvania RR had no great sympathy for articulated locomotives, but when Union Pacific came out with the Big Boy, some managers of the "Standard Railroad" (Pennsylvania had standardized even the toilet paper) decided to respond in kind. The result was the T1 and the Q2 duplex, among the most unconventional locomotives ever circulated in series (obviously not comparable with the prototypes mentioned on this site) but still the impressiveness of Big Boy was not diminished. The person in charge of the marketing department, who did not understand anything about technique, came out with the famous joke "Hey, let's double the J". Since the J was PRR's most modern locomotive, a magnificent 2-10-4, the result would have been an incredibly powerful machine that, as Virginian had demonstrated with its 800 series, could easily circulate pulling incredible parades of wagons. A prototype was built, but on the Horseshoe curve it got so stuck that to free it they had to cut it and made two excellent Js. The JJs (Geigeies) 61000 is still the most powerful locomotive ever built in America. Note the spacious and comfortable "doghouse" well beyond the standards of the time, on the first tender.



Pennsylvania RR JJs
Pennsylvania RR JJs
Country	USA
Year	1938
Class	Superheated steam 4 cylinder single esp.	2-10-10-4


As it is universally known, the Pennsylvania RR had no great sympathy for articulated locomotives, but when Union Pacific came out with the Big Boy, some managers of the "Standard Railroad" (Pennsylvania had standardized even the toilet paper) decided to respond in kind. The result was the T1 and the Q2 duplex, among the most unconventional locomotives ever circulated in series (obviously not comparable with the prototypes mentioned on this site) but still the impressiveness of Big Boy was not diminished. The person in charge of the marketing department, who did not understand anything about technique, came out with the famous joke "Hey, let's double the J". Since the J was PRR's most modern locomotive, a magnificent 2-10-4, the result would have been an incredibly powerful machine that, as Virginian had demonstrated with its 800 series, could easily circulate pulling incredible parades of wagons. A prototype was built, but on the Horseshoe curve it got so stuck that to free it they had to cut it and made two excellent Js. The JJs (Geigeies) 61000 is still the most powerful locomotive ever built in America. Note the spacious and comfortable "doghouse" well beyond the standards of the time, on the first tender.