Say George, no I wasn't on the BN when the GI Diamond was still in. Stories were shared about the delays, and so fourth. For the amount of coal traffic Ravenna Sub and UP Columbus Sub sees, I'm sure it was a real bottlelneck.
I have crossed over the UP/BNSF Fremont Diamond many times, it's a rough one-ride that is, (it is to be replaced sometime this summer), but the delays were not all that bad. Sometimes DS 20 would give us clear indication, and we would shoot right through at a blazing 10mph!
Another "scary" diamond is the BNSF/F&EVR (CNW) north of Fremont. It is a 10mph ride across that one, but it has been reported that there have been a few near misses with the Dinner Train, due to the automatic interlocking "malfunctioning". What I have been told, the Dinner Train Crew has a mindset that a "malfunctioning" interlocking means "gun it!!"
Guess F&EVR they haven't read up on GCOR Rule 5.15, Improperly Displayed Signal or 9.12.3, Automatic Interlockings.