What is This? (BNSF Dash 9 Spark Arrestor?)

[east_bay_alex]

Does anyone know what this contraption is around the stack? I've noticed these on more and more BNSF Dash 9 units recently...

Thanks for the info!!

 

[papio]

Some type of experimental device to help comply with CA emissions requirements?

 

[markgillings]

It's a cover for when the locomotives are stored. Two halves, front and rear, lift up and fold down.

 

[east_bay_alex]

It's a cover for when the locomotives are stored. Two halves, front and rear, lift up and fold down.

Makes sense since the Dash 9 locomotives seem to be coming in and out of storage with traffic level swings... Thanks for the info!