With all due respect, might I add that most engines have parts from other engines. I know for a fact that 464 has 454's boiler and an eccentric assembly from 455 and a main rod from 462. 492 has 490's smokebox and 497 has 492's lead truck. 492's current lead truck is probably from 496 which came to 497 as the result of the 1960 derailmet at Cumbres. I am sure that Carlos would tell you that not every part on any engine at Chama is stamped with the "correct" number. With the exception of the "laundry boiler" (I like that accurate description) what you see of NCNG 5 is how it was in the mid to late 1930's after her numerous encounters with disaster. And during the NCNG days, 7 had 6's tender and 8 had 7's tender, a shuffle needed to keep all of the motive power that could operate operable. I have photos of RGS 455 using 452's tender after her own derail twice in as many days. Companies did that to keep as much equipment on the road as possible so that they could make money.