LIRR Early Motive Power 
The LIRR locomotive renumbering took place effective October 1, 1898  

lirr45_4-4-0_builtSchenectady_12-1870_ LIRRer June-1954.jpg (137772 bytes)
LIRR 4-4-0 #45 12/1870

4-4-0 #45, built by Schenectady in December, 1870, was renumbered #8.

Now . . . the only #8 that the LIRR rosters show in later years (c. 1920) is G54sd (4-6-0) camelback built new in 1902 and retired in the late 1920s. 

Therefore, we can conclude that, to avoid duplicate road numbers, (probably the MAIN reason for the renumbering of October, 1, 1898) renumbered 4-4-0 #8 was withdrawn from service either in 1902 or prior to that date, which sounds about right, because:

1.  It was a VERY old locomotive style and not strong enough to pull longer trains.  
2.  It was 18 years older than renumbered #48 mentioned above, which was STILL on the roster until the 1920s.  
3.  Being built in 1870, it would have been 31 years old in 1902 if it were still in service:  a long life for a locomotive!  
4.  In 1902, brand-new G54sd camelback #8 went into road service and there was, obviously, no duplication of road numbers at that point in time.  Research: Dave Keller

LIRR 4-4-0-Train-at Station-Port Jefferson-View E - 1878  (Brainard-Keller).jpg (94669 bytes)
LIRR 4-4-0- Train at Port Jefferson Station view E 1878 (Brainard-Keller)

NEW YORK & SEA BEACH RR-2-4-0 No.2-BAY RIDGE - c. 1887.jpg (73542 bytes)
New York & Sea Beach RR 2-4-0 #2 Bay Ridge c.1887

LIRR-Loco-1888 Blizzard-1st RJ tower in bkgd.jpg (33476 bytes)
LIRR Loco Blizzard 1888 First RJ Tower, Rockaway Junction in background 
lirr125-c.1895.jpg (89670 bytes)
LIRR #125 c.1895
LI 0-6-0 198 - Builder's Photo - {Sam Shumaker Collection}.jpg (63666 bytes)
LIRR 0-6-0 #198 
Builder's Photo 
Archive: Sam Shumaker
lirr93.jpg (36414 bytes)
LIRR #93 Builder's Photo Rogers Locomotive & Machine Works
WAS no.44 BEFORE 1898 no.6 c.1900.JPG (79298 bytes)
 LIRR #6 c.1900 prior #44 before 1898
4-4-0 No. 524 being turned on turntable-Washington St., Jamaica- View W-1904.jpg (114127 bytes)
LIRR  4-4-0 #524 being turned on turntable at Washington St., Jamaica view W 1904
Archive: Dave Keller
LIRR-no.38_4-4-0_Tank-Engine_c.1888.jpg (92692 bytes)
LIRR 4-4-0 #38 Tank Engine c.1888 at
Woodhaven Junction

Built June 1867 as a 4-4-0 by Schenectady - Constr. No. 450 - named the "Thurlow Weed" rebuilt 1885 for rapid transit service on the Atlantic Division - photo circa 1888
Note: Check out that outside bearing pilot truck with fenders and equalizer 

D56-First Run of the Cannonball-ParlorTrain-Mtk-1899.jpg (44754 bytes)
D56 pulling parlor car extra eastbound into Montauk Station  c.1910 Archive: Keller

Miscellaneous Locomotives - Tanks and Forneys
0-4-0T_321-Shop Switcher-Morris Park Shops-c. 1920.jpg (110130 bytes)
0-4-0T #321 Morris Park shop switcher c.1920
0-4-4T Forney No. 109 - MP Shops - c. 1890.jpg (86675 bytes)
0-4-4T Forney #109 Morris Park shops c.1890 Archive: Dave Keller
0-4-4t No. 109-Rockaway Jct-Summer-1896 (Keller) (2).jpg (79491 bytes)
0-4-4 #109 Rockaway Jct. summer 1896
Archive: Dave Keller
0-4-4-T Forney Nos. 159-158-at Baldwin Loco Wks-05-1892.JPG (95985 bytes)
Forney 0-4-4T #159-158 at Baldwin Loco Works 5/1892 Archive: Dave Keller
0-4-4t No. 220-Rockaway Jct-Frank Hawkins on Engine-c. 1896 (Keller).jpg (112102 bytes)
0-4-4T #220 Rockaway Jct. Frank Hawkins on Engine c.1896 Archive: Dave Keller
2-4-4t 211 with train-at Station-Oriental Hotel-Manhattan-Beach_1898.jpg (105303 bytes)
2-4-4T #211 with train at Station Oriental Hotel - Manhattan Beach 1898 
Archive: Dave Keller
LIRR 2-4-6T Mason Bogie at Engine House - 1890 (Huneke).jpg (78068 bytes)
2-4-6T Mason Bogie at Engine House 1890 
Archive: Art Huneke 
Station-Sag Harbor-Forney_0-4-6T 327-View E - 1903 (Keller).jpg (104066 bytes)
Forney 0-4-6T #327 Station Sag Harbor View E 1903 Archive: Dave Keller