For those who might wonder why this locomotive is no longer seen in UP consists. It has been probably about 2 years since UP SD70ACe #4141 (The George HW Bush unit) has been seen in revenue service. This link will show you where it is currently setting in N Little Rock, AR. It is somewhat of a mystery as to why it has been here 2 years setting in the weather. It is reportedly run regularily in the local area and it in good operating condition. Rumors abound as to why it is here but UP seems "mum" as to making any statement about it.
http://thundertrain.org/trains-wreck-050611.html
http://thundertrain.org/trains-wreck-050611.html