I hasten to point out that this connection is conjecture, not fact, no matter how similar they appear. I showed the picture to Andy Probert and he said he'd never seen that before, so it wasn't around the TMP art department. Since Richard Taylor designed the nacelles, someone would have to show it to him and see if he says "yes". And since Matt Jefferies designed the Phase II nacelles on which the TMP ones were roughly derived, the origin of the design promises to be muddy.
I now agree with that assessment. It comes down to what Matt Jeffries was thinking of when he designed Phase II. The nacelle's locomotive look could conceivably be a coincidence. Or MJ might have remembered the M-1 locomotive as the height of looking futuristic and powerful when it was new and he was about 26 years old.