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Reply to "Big Boy #4014 moves under power for the first time in over 50 years β€’ The UP is bringing out the 4014, see schedule πŸš‚"

My first question: At the Union Pacific Steam Club

Why does that Union Pacific Big Boy 4014, have a diesel pusher behind the Big Boy engine? Thanks 

This is a review of all the answers: Running on a class one railroad requires more braking to be onboard than the steamer provides and adds dynamic braking as well. Plus electrical power for the passenger cars. Also clearing the main line in case of a breakdown. The Union Pacific has liability insurance and the insurance company want back up locomotives for safety and to get the passengers to a safe area if the Big Boy breaks down. These are just some of the reasons and there are more technical issues to be resolved like PTC. (Positive Train Control) 

Source: β€œUnion Pacific Steam Club ” β€’ Excerpts from 25 answers

Gary: Rail-fan

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