That is a 'Monster' - it is longer than normal and has a
'ventilated' rear power unit. Looks like the repair shop
took a unit that smashed up the cab but had a good generator
and made a monster for long coal cars or heavy loads.

Martin

On 6/28/2013 7:34 PM, Ignoramus10926 wrote:
http://igor.chudov.com/tmp/Union-Pac...Locomotive.jpg