SERVICE HISTORY
In late 1994, MRR 4400 - the first of a 200-unit order of GE AC4400CW locomotives - was delivered in MRR's newest livery at the time, known as AR1. This scheme featured a cornflower blue body with a white arrow and accents overtop a gray frame.
In 2011, the unit was repainted into the AR2 livery, an almost identical design to AR1 with the colors inverted. 4400 was outshopped alongside 4444, which wore the special "Quad-Fours" scheme. Unit 4444 was unfortunately retired following a derailment in 2015.
By 2019, 4400 received MRR's ST1 livery, a radically redesigned scheme featuring an all-new logo. The ST1 design draws inspiration from the final livery of the Chicago and Northwestern Railway, and Union Pacific's "Shield and Wings" logo.
In 2021, the locomotive underwent a major rebuild and modernization program incorporating new energy and fuel-saving technologies. The most notable visual changes included the addition of radiator-top shutters and extra rooftop equipment above the cab.
After accumulating over 1.5 million miles in service - and with many more ahead - MRR 4400 and her sister units continue to serve as a backbone of MRR operations alongside the more powerful AC6000 series.
STARTUP
It follows the same startup procedure as the SARR AC4400CW that it is built upon. The template is attached under Required Items.
DESIGNATION
AC = Alternating Current (AC) Traction Motors
44 = 4400hp diesel engine (GE 7FDL-16 Turbo)
C = C-C Wheel Arrangement (Giving the locomotive six axles, all powered)
W = Wide nose American Safety Cab
EXTRA FEATURES
This locomotive is equipped with a functional air horn, togglable strobing lights for Officer Special and/or other high-priority trains, and alternating flashing ditch lights with varying settings.
HORN
This locomotive is equipped with a 3-chime air horn which plays a B minor chord tuned to A=228Hz. The chord is tuned to the Harmonic Just tuning in the key of B.
Chime 1 (Low): ~D (307.1 Hz)
Chime 2 (Mid): ~F# (383.9 Hz)
Chime 3 (High): ~B (511.8 Hz)
