I think the answer is yes...sorta. I've been riding the Metra UPNW line for the past two years to and from work on a daily basis, and for several years before that on the occasionally basis, but this was the first time I can remember seeing a car at Sipi. This was back on December 17th 2011. It's not my best photo, but you should be able to see the single gondola, but in curious dressing. There was a white liner in it, and at least one worker in a white hazmat jumpsuit by it. My theory is that yes they are still served, but minimally to remove whatever hazardous materials they accumulate over time. I recently video recorded the tracks through their lot, and yes, the ones leading towards Elston are all paved over. I hope this photo helps some.