Everyone - We have archived LIRR topics concerning both the retired 503 and the converted 423...
DE30 423 was converted back in 2013 from DM30 507 to a straight diesel removing its third rail capability.
viewtopic.php?f=63&t=151444
Topic: "DE30 Numbers" from 2013. On page 2 there is a close-up picture posted by W2YMM on 11/14/2013
of the front end of the then-recently renumbered 423 showing the 507 behind the front end horns.
DM30 503 has been sidelined and later retired after an accident and fire back in 2000.
viewtopic.php?f=63&t=11237
Topic: DM30#503 Meltdown (February/March 2005)
This should further clarify the differences between these two locomotives...MACTRAXX
EXPRESS TRAIN TO NEW YORK PENN STATION-NO JAMAICA ON THIS TRAIN-PLEASE STAND CLEAR OF THE CLOSING TRAIN DOORS