Here is an MTH 40-4000 O Z-4000 400W Dual Control Transformer from 1998. This monster is specifically designed to operate modern-era locomotives and equipment.
Features:
Sine Wave Output
(2) )-22 VAC, 165 VA Variable Outputs
(1) 14V, 1.5-Amp Fixed-Voltage Output
(1) 10V, 1.5-Amp Fixed-Voltage Output
Digital LED Displays For Realtime Voltage & Amperage Readings of the Variable Outputs
Microprocessor Controlled, Smart Operation During Short Circuit Conditions & Expendable Design
(2) Bell Button For Tracks 1 & 2
(2) Horn/Whistle Button For Tracks 1 & 2
(2) Direction Buttons For Tracks 1 & 2
(2) Program Buttons For Tracks 1 & 2
On/Off Power Switch
Large Power On LED Indicator
Large Overload LED Indicator
12 Amp Resettable Circuit Breakers On Track 1 & 2 Variable Outputs
4 Amp Resettable Circuit Breakers For Fixed Outputs 10V & 14V
Expansion Port For Future Upgrades
Internal Cooling Fan For Low Operating Temperatures
Compatible Power Source For All O Gauge, AC-Powered Locomotives
Rugged ABS Construction

This item has been graded per TCA standards C-8: Like New based on visual appearance. The original box is included. Please check the photos for a detailed look at this item. [120640286] Overall condition is Like New.

Condition: Like New (C-8)
Operational Status: Functional
Original Box: Yes (P-7)

Manufacturer: MTH
Model Number: 40-4000
Years Manufactured: 1998 – ????
Road Name: **** No Road Name

Scale/Era: O Modern
Model Type: Control & Electrical

The SKU for this item is 5981452.

Product Id: 11415165