Lionel 2631170 - Legacy K4 Brass Hybrid Steam Locomotive "Pilot" #9999 (1188)

• Road Number: 9999
• Gauge: O Gauge 
• Power: Electric
• Engine Type: Steam
• Min Curve: O60
• Dimensions: Length: 22"
• Most Recent Catalog: October Release 2025
  

Features:

LEGACY® Control System equipped – able to run in LEGACY® Control mode, in TrainMaster Command Control mode, or in Conventional mode with a standard transformer
Bluetooth® Control - Operate with Universal Remote or LionChief® App
Lionel Voice Control (LVC) - run your locomotive by speaking commands into your phone via LionChief® App
Odyssey® II Speed Control
LEGACY® RailSounds® sound system featuring:
CrewTalk™ dialog with different scenarios depending on whether the locomotive is in motion or stopped
TrainSounds that mimic operating dialog when the locomotive is in motion or stopped
Six official railroad speeds with CrewTalk dialog
DynaChuff™ synchronized with 32 levels of intensity as the locomotive gains speed
LEGACY® "Real-Time Quilling Whistle" control with instant response for realistic signature "quilling" and correctly timed warning signals
5 different whistles to choose from for a more customized experience
Single hit or continuous mechanical bell sounds
5 levels of bell pitching for customized sounds
Sequence Control: plays the sound effects of an entire trip, including warning sounds and announcements, based on the movement and speed of the locomotive
Current speed and fuel dialog, coal or oil loading sound effects
IR Transmitter that works with LCS SensorTrack™
Powerful maintenance-free motor with momentum flywheel
Wireless Tether™ connection between locomotive and tender
ElectroCoupler™ on rear of tender
Directional lighting including operating headlight and back-up light on rear of tender
Bicolor illuminated classification lights on the front of locomotive where applicable. Using a Legacy controller, change the color of the classification lights between white or green
Traction tires
Interior illumination in cab
Die-cast metal locomotive body, pilot, and trucks
Die-cast metal tender body and trucks
High level of separately applied metal details
Separately applied builder's plate
Synchronized fan-driven smoke unit
Adjustable smoke output
Authentically detailed cab interior
Cab "glass" windows
Engineer and fireman figures
4-Digit Addressing
Whistle steam
Road-number specific details
Kinematic drawbar with drop-plate
Force Coupler

Overview:

No. 5399 was the most mechanically successful of the poppet valve experiments, leading to their inclusion on the T1 Duplexes. Lima also took some liberties with a little streamlining on the running boards during her rebuild. Add in a front-end throttle cover and you've got a truly unique K4. 5399 received the usual front end pilot and smokebox changes in the mid-1940s and we're offering both variations with appropriate period paint and lettering. To call any of these K4s streamlined would be quite mistaken, but we felt they were all special enough to stand out in unique deco schemes as well. To that end, we've applied a "what if" fantasy scheme based on other Pennsy practices to each of these variations.