If you'd like the LIRR's DM-30s, please TAKE THEM!!!!!
I don't think any piece of equipment on the LIRR is hated by commuters more than the DM-30s.
Well, because they don't work. And they're lousy diesels too - noisy, slow as heck, can't pull a long train. Nothing's more fun than finding your morning train's cancelled at Jamacia and having to pack into an already overstuffed Babylon or Ronkonkoma train. It's even more fun when the locomotive decides to torch itself, or break down altogether some other way.
Ask any LIRR rider (as opposed to railfan), and they'll tell you that the DM-30s suck.
Light rail? Well, it's cheaper to run than commuter rail because there's no FRA involved.....