San Francisco Bay Railroad No. 30 in April 2021.

(Pi.1415926535, CC BY-SA 4.0 <>, via Wikimedia Commons)



The KLW SE10B is a low-emissions diesel switcher locomotive built by Knoxville Locomotive Works. It is powered by a single MTU Series 2000 engine which develops a total power output of 1,050 horsepower (783 kW). There have been three SE10B locomotives produced for New York New Jersey Rail, and 5 have been produced for Chevron to be used in the refineries of Houston and Beaumont-Port Arthur, Texas.


Original buyers

Railroad Quantity Road numbers Notes
New York New Jersey Rail (NYNJR) 3 5101 - 5103
Chevron (Texas) 5 1001 - 1005
San Francisco Belt Railroad (California) 1 30 ex-Alco S-2 No. 25
Stockton Terminal and Eastern Railroad (California) 1 1050


Type and origin
Power type: Diesel-electric
Builder: Knoxville Locomotive Works (KLW)
Model: SE10B
Build date: August 2015 – Present
Total produced: 10
Gauge: 4 ft 8+1⁄2 in (1,435 mm)
Prime mover: MTU Series 2000
Performance figures
Power output: 1,050 hp (783 kW)
Operators: See table above