News photo: Tier 4 unit debuts for North Carolina

News photo: Tier 4 unit debuts for North Carolina

By Trains Staff | March 1, 2023

| Last updated on August 6, 2025


Locomotive is first for NC DOT to use Blended After Treatment System

Passenger train with two locomotives at one end and one at the other
Piedmont train No. 75 departs Raleigh, N.C., on Tuesday, Feb. 28. The second locomotive, No. 1859, is testing a Tier 4 emissions system. Laurence Pearlman

RALEIGH, N.C. — The North Carolina Department of Transportation has begun testing a locomotive equipped with a Tier 4 emissions control system. On Tuesday, Feb. 28, state-supported Piedmont train No. 75 included three locomotives, with one, No. 1859, equipped with Rail Propulsion Systems’ Selective Catalytic Reduction technology. The train departed Raleigh for Charlotte with 1859 as the second unit.

The system, referred to as “Blended After Treatment System,” or BATS, reduces emissions from both the prime mover and the head-end power generator.

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