MPI MP20B explained

The MPI MP20B is a diesel-electric locomotive designed and built by MotivePower in Boise, Idaho.

Specifications

It has a 2000hp MTU-Detroit Diesel 12V4000 engine. It weighs approximately 277,000 lb and is 59 ft 2 in long. It has a maximum speed of 70mph. It also includes a B-B wheel arrangement and an optional dynamic brake. It includes a continuous tractive effort of 55000lbf and a starting tractive effort of 85000lbf.^[1]

Union Pacific MP20Bs were powered by a Caterpillar 3516C.^[2]

Owners

Owner	Built	Number	Notes
Pacific Harbor Line[3]	2008	2
New Jersey Transit[4] [5]	2008	5	Rebuilt from EMD GP40FH-2s
Union Pacific[6]	2008	13	Rebuilt from EMD GP50s

Notes and References

1. https://web.archive.org/web/20081212163327/http://www.motivepower-wabtec.com/locomotives/low-horsepower/mpex-low-emissions-locomotives.php MPE-X Low Emissions Locomotives
2. UP receives cool Cats from Boise Trains July 2007 page 24
3. Web site: Pacific Harbor Line. The Diesel Shop. 7 October 2010.
4. Web site: New Jersey Transit Fleet. The Diesel Shop. 7 October 2010.
5. https://web.archive.org/web/20110318053404/http://www.greenrailnews.com/mpi.html MotivePower/Wabtec
6. Web site: UP Diesel Locomotive Roster, UP Yard Switch Roster, Part 3. UtahRails.net. 7 October 2010.