MTH 20-3937-1 Great Northern  4-6-6-4  Z-6 Challenger- #4001 Green

Intricately Detailed, Die-Cast Boiler and Chassis
Intricately Detailed, Die-Cast Tender Body
Authentic Paint Scheme
Die-Cast Locomotive Trucks
Handpainted Engineer and Fireman Figures
Metal Handrails, Whiste and Bell
Metal Wheels and Axles
Remote Controlled Proto-Coupler
O Scale Kadee-Compatible Coupler Mounting Pads
Prototypical Rule 17 Lighting
Constant Voltage LED Headlight
Operating LED Firebox Glow
Operating LED Marker Lights
Operating LED Numberboard Lights
Lighted LED Cab Interior
Operating Tender LED Back-up Light
Powerful 7-Pole Precision Flywheel-Equipped Motor
Synchronized Puffing ProtoSmoke System
Steaming Quillable Whistle
Locomotive Speed Control In Scale MPH Increments
Wireless Drawbar
1:48 Scale Dimensions
Onboard DCC/DCS Decoder
Proto-Scale 3-2 3-Rail/2-Rail Conversion Capable
Proto-Sound 3.0 With The Digital Command System Featuring Quillable Whistle With Freight Yard Proto-Effects
Unit Measures: 30 3/4" x 2 1/2" x 4"
Operates On O-72 Curves Steam DCC Features
F0 Head/Tail light
F1 Bell
F2 Horn
F3 Start-up/Shut-down
F4 PFA
F5 Lights (except head/tail)
F6 Master Volume
F7 Front Coupler
F8 Rear Coupler
F9 Forward Signal
F10 Reverse Signal
F11 Grade Crossing
F12 Smoke On/Off
F13 Smoke Volume
F14 Idle Sequence 3
F15 Idle Sequence 2
F16 Idle Sequence 1
F17 Extended Start-up
F18 Extended Shut-down
F19 Labor Chuff
F20 Drift Chuff
F21 One Shot Doppler
F22 Coupler Slack
F23 Coupler Close
F24 Single Horn Blast
F25 Engine Sounds
F26 Brake Sounds
F27 Cab Chatter
F28 Feature Reset