Atlantic Coast Line 1504 is a 4-6-2 "Pacific" type steam locomotive built in March 1919 by American Locomotive Company (ALCO) of Richmond, Virginia, for the Atlantic Coast Line Railroad (ACL) as a member of the P-5-A class under the United States Railroad Administration (USRA) standard.

1504 was put on display in Jacksonville, Florida as the only original USRA Light Pacific steam locomotive to be preserved.

1504 locomotive is currently being restored to operating condition for use in excursion service on the South Central Florida Express (SCFE) shortline railroad in Clewiston, Florida as part of U.S. Sugar's (USSC) heritage tourist passenger train named the Sugar Express, where it will eventually run alongside ex-Florida East Coast Railway (FEC) No.

1504 was the fifth member of 70 United States Railroad Administration (USRA) Light Pacifics built by the American Locomotive Company (ALCO) between 1919 and 1920 for the Atlantic Coast Line Railroad (ACL), where they served as ACL's primary mainline passenger steam locomotives.

1504 and the P-5-As produce 47,535 lbf (211.45 kN) of tractive effort, which allowed them to haul 10-12 passenger cars at more than 70 mph (113 km/h).

[2] While some of the P-5-A locomotives were upgraded with Worthington feedwater heaters, disc driving wheels, and larger tenders to improve their performances, No.

[12][b] During the winter of 1939 and 1940, the P-5-As were found capable of handling the Miamian from Richmond to Jacksonville in 11 hours and 25 minutes via all cutoffs, providing an average speed of 56.5 mph (91 km/h).

[9][10] Additionally, it pulled two crack Montgomery-Jacksonville passenger trains; the Florida Arrow and the South Wind, which ran via Thomasville and Waycross, Georgia.

[1]: 7 [9] Sometime after 1940, the locomotive's tender was repainted from its original Roman style ATLANTIC COAST LINE lettering to ACL's new circular herald logo with white stripe.

1504 pulled the Gulf Coast Limited passenger trains between Jacksonville and St. Petersburg, Florida, via Burnett's Lake, Gainesville, Ocala, Leesburg, and Trilby.

[9][10] In their twilight years of service, the locomotive and the other P-5-As hauled 50-60 freight cars on the mainline at maximum allowable speeds.

[14] Additionally, it was the only USRA Light Pacific steam locomotive to be preserved in original as-built condition, excluding its headlight, tender trucks, and pilot wheels.

[18] In July 2013, the North Florida Chapter NRHS launched the Project Return to Glory group to fund the cosmetic restoration of the No.

[18][20] In late October 2013, the North Florida Chapter NRHS received $10,000 from Trains Magazine and an additional $10,000 from CSX Corporation with a total of $20,000.

[18][21] The cosmetic restoration work would include adding new cab windows and doors, and renovating the headlamp.

1504 was disassembled from static display and moved to the former Lucey Boiler Company building in Chattanooga, Tennessee, the same place where Southern Railway 4501 was originally restored in the mid 1960s.

[26][27] During the restoration work, the locomotive's deteriorated tender body had to be replaced by a new one with original specifications and conversion to burn recycled cooking oil fuel instead of coal.

1504 will eventually run alongside another 4-6-2 steam locomotive, ex-Florida East Coast Railway (FEC) No.