The Eastern end of the Island (among other places) is Diesel territory. The Railroad's M-7 and M-3 electric trains cannot operate East of Babylon or Ronkonkoma.  What the LIRR uses are Diesel-Electric and Dual-mode Locomotives in these areas.  Dual-mode locomotives can generate their own electricity for the traction motors, or draw it from the third rail in electrified territory.  This enables the Dual-Mode locomotives to travel into Penn Station; something the Diesel Electrics cannot do due to the exhaust they produce.

    The LIRR's diesel fleet currently consists of 45 locomotives.  23 are Diesel-Electrics and 22 are Dual-Modes.  These numbers were originally identical, but one Dual-Mode, # 503, was damaged beyond recovery due to a fire several years back, and is currently sitting on a scrap line.

The Diesel-Electrics (DE30AC)'s are 400 series numbers; The Dual-Modes (DM30AC)'s are 500 series numbers.  The easiest way to tell them apart (other than the numbers) being the lack of third-rail shoes on the DE's

# 400 - Eastbound at Islip

4/30/08

#401 - Waiting to Leave Greenport

8/2/08

#401 - Entering Bay Shore

7/1/08

#401 - Approaching Southhold

8/2/08

 #402 - Eastbound at Amagansett

3/21/08

#402 - Eastbound Connetquot River

6/27/08

#402 - Eastbound in Bay Shore

#403 - Eastbound at Islip

12/8/07

#403 - Eastbound at King's Park

10/18/08

#404  - Westbound at Great River

12/15/07

#404 -  Eastbound in Islip

7/22/08

#404 - Westbound at Sayville

12/31/07

#405 - Westbound at Hampton Bays

2/16/08

# 405 - Departing King's Park

10/18/08

#405 -  Eastbound at Islip

7/10/08

#406 - Westbound at Montauk

3/21/08

#406 - Eastbound at Oakdale

12/31/07

#406- Westbound at Sayville

#407 - Eastbound Central Branch - Albany Ave

5/16/08

#408 - Eastbound MP45 - Great River

#408 - Eastbound at Sayville

#409 - Eastbound at Nassau Ave, Islip

#409 - Arriving at Bay Shore

7/1/08

#410 - Westbound at Nassau Ave, Islip

#411 arriving at Islip

7/10/08

# 413 - Eastbound in Bay Shore

7/23/08

#413 - Arriving in Bay Shore

6/23/08

#415 - Port Jefferson

9/14/08

# 415 - Eastbound at Bay Shore

7/18/08

# 415 -  Eastbound at Smithtown

9/14/08

#416 - Westbound at Patchogue

2/11/08

#417 - Westbound at Islip

#417 - Departing Bay Shore

7/1/08

#417 - Eastbound at Islip Avenue

#419 - Westbound at Islip

6/22/08

# 419 - Eastbound approaching Islip

7/17/08

#420 - Eastbound at Islip

6/6/08

#420 - Eastbound at Westhampton

1/13/08

#421 - Westbound at Islip

11/19/07

#421 - Eastbound at Islip

12/8/07

#422 - Eastbound at Connetquot River

6/27/08

#501 - Eastbound - Bay Shore

6/20/08

# 501 - Eastbound in Bay Shore

7/19/08

#502 - Eastbound in Bay Shore -

"The Cannonball"

6/6/08

#502- Eastbound in West Islip

"The Cannonball"

6/13/08

# 504 - Eastbound  Bay Shore

"The Cannonball"

6/20/08

# 505 Port Jefferson Yard

9/14/08

#505 - "The Cannonball" - Islip

8/22/08

#508 - Eastbound at Islip -

"The Cannonball"

5/23/08

#508 - Eastbound at Islip

4/10/08

# 508 - Eastbound at Islip

#510 - Westbound at Connetquot River

6/27/08

# 512 - Westbound in Bay Shore

7/18/08

# 513 - Westbound at Bay Shore

7/18/08

#514 - Westbound at Islip

5/31/08

#517 - Westbound in Bay Shore

7/11/08

#517 - Arriving at Islip

7/8/08

#518 - Eastbound Passing Islip

7/25/08

#519 - Eastbound at Oakdale

"The Cannonball"

7/3/08

# 519 - Eastbound in Bay Shore

"The Cannonball"

7/18/08

#522 - Eastbound at Nassau Ave, Islip

# 522 - Eastbound passing Bay Shore

"The Cannonball"

7/18/08

#522 - Eastbound passing Oakdale

"The Cannonball"

7/3/08