I have a ConCor 50' ribbed reefer in SPFE colors, with a running number of 676898. I can't find a record anywhere of this as a genuine number. The SP number 676898 is a different animal altogether (but I assume SPFE had separate running numbers from SP, or...?) Can anyone tell me if this is a genuine number (and if so, what is the range involved). If not, is this even a genuine model (i.e. was there a 50' ribbed SPFE reefer)? If it is genuine, and the number isn't, what number range should they have. Many thanks for any help with this!

Seems from a quick internet check, the first two digits for SPFE reefers are in the "45" series. Here's a perfect explination of SPFE reefer numbers! http://www.railgoat.railfan.net/spcars/byclass/reefer/r070-20.htm

According to http://www.railgoat.railfan.net/spcars/byclass/reefer/index.htm there were several classes of 50' ribbed-side reefer. However, I can't find any evidence for numbers higher than 460700.

Certainly not all of them, though 450000-series numbers do seem most common in photographs. They had 200000-series and 300000-series numbers on some classes, among others.